BillReminder

Billing5 EndpointsBilling / BillReminder

This method will get all BillReminder Objects

GET/api/invoice/bill_reminder

Query parameters

`id`string
`name`string
`globalDefault`boolean
`billReminderCount`string
`template`string
`predefinedBillingItem`string
`deleted`boolean	This property is used to mark an entity as deleted / archived
`searchString`string	text to search for in the list
`orderFieldName`string	name of the order field
`orderFieldSort`string	sorting modeAllowed: `DESCASC`
`page`integer	page of the list
`pageSize`integer	number of entries for each page
`withMaxPageNumber`string	returns the number of pages available as a header if this is set

Responses

200Returns a list of BillReminder objectsarray<BillReminder>

Show fields (7)

idinteger
Primary key of the bill reminder. Internal ID.
namestring
Name of the reminder level, for example first reminder.
global_defaultboolean
Default reminder for all companies.
bill_reminder_countinteger
Level of the reminder, starting at 1.
templateFlexibleLatexTemplate
Document template of the reminder.
Show fields (35)
- predefinedboolean
  True for templates shipped by the servercontrolpanel (PredefinedFlexibleTemplateMap). Their IDs are referenced by code, so the UI offers to duplicate ("Vorlage anpassen") instead of editing them.
- data_typestring
  Data type (reference class key) the template is rendered and checked with. For predefined templates (tag IW_PFLT) this is the data type of the code that uses them.
- data_type_labelstring
  Human readable name of the assigned data type, null for tags that are not a known data type.
- template_modestring
  Serialized mode so clients do not have to know that null means standard.
- last_check_statusstring
  Summary of the last template check for list views, the full result is admin detail only.
- idstring
  Primary key of the template. Internal ID. Used as a string identifier.
- namestring
  Name of the template.
- tagstring
  Tag used to group templates.
- mass_messageboolean
  Whether the template is used for mass messages.
- default_store_as_pdfboolean
  Whether the generated document is stored as PDF by default.
- security_scopestring
  Scope that controls who can use the template.
- security_user_access_typeinteger
  Access type required to use the template.
- param1string
  Value of parameter 1 used in the template.
- param2string
  Value of parameter 2 used in the template.
- param3string
  Value of parameter 3 used in the template.
- param4string
  Value of parameter 4 used in the template.
- param5string
  Value of parameter 5 used in the template.
- param6string
  Value of parameter 6 used in the template.
- param7string
  Value of parameter 7 used in the template.
- param8string
  Value of parameter 8 used in the template.
- param9string
  Value of parameter 9 used in the template.
- param10string
  Value of parameter 10 used in the template.
- default_value_param1string
  Default value of parameter 1.
- default_value_param2string
  Default value of parameter 2.
- default_value_param3string
  Default value of parameter 3.
- default_value_param4string
  Default value of parameter 4.
- default_value_param5string
  Default value of parameter 5.
- default_value_param6string
  Default value of parameter 6.
- default_value_param7string
  Default value of parameter 7.
- default_value_param8string
  Default value of parameter 8.
- default_value_param9string
  Default value of parameter 9.
- default_value_param10string
  Default value of parameter 10.
- deletedboolean
  This property is used to mark an entity as deleted / archived
- createdstring (date-time)
  Point in time the entity was created.
- updatedstring (date-time)
  Point in time the entity was last updated.
predefined_billing_itemPredefinedBillingItem11
Billing item charged with the reminder fee.
Show fields (81)
- idinteger
  Primary key of the mapped billing item. Internal ID.
- namestringrequired
  Name of the billing item.
- descriptionstringrequired
  Description of the billing item shown to the customer.
- internal_descriptionstring
  Internal description of the billing item, not shown to the customer.
- fixed_hoursnumber (float)
  Fixed number of hours billed.
- fixed_pricenumber (float)
  Fixed price billed.
- fixed_price_base_unitnumber (float)
  Base unit for the fixed price.
- price_fixed_hoursnumber (float)
  Price for the fixed hours.
- price_additional_hoursnumber (float)
  Price for each additional hour.
- name_additional_hoursstring
  Name of the additional hours item.
- description_additional_hoursstring
  Description of the additional hours item.
- time_billed_on_ticket_closeboolean
  Whether the time is billed when the ticket is closed.
- billing_typeBillingItemType
  Billing item type.
- buying_pricenumber (float)
  Purchase price of the item.
- recurrenceCRMRecurrence
  Recurrence the billing item follows.
- deletedboolean
  Whether the billing item is deleted.
- condition_date_afterstring (date-time)
  The item applies only to dates after this date.
- condition_date_beforestring (date-time)
  The item applies only to dates before this date.
- condition_country_codestring
  Country code the item applies to.
- condition_zip_code_fromstring
  Start of the postal code range the item applies to.
- condition_zip_code_tostring
  End of the postal code range the item applies to.
- condition_time_after_hourinteger
  The item applies only after this hour of the day.
- condition_max_lengthinteger
  Maximum length the item applies to.
- condition_time_before_hourinteger
  The item applies only before this hour of the day.
- condition_sub_access_tagAccessTag
  Access tag a subscription must have for the item to apply.
- condition_show_despite_missing_access_tagboolean
  Whether the item is shown even if the access tag is missing.
- condition_sub_free_logicstring
  Free-form condition logic for the subscription.
- fixed_price_logicstring
  Free-form logic that calculates the fixed price.
- sub_self_service_addboolean
  Whether members can add the subscription themselves.
- sub_self_service_deleteboolean
  Whether members can cancel the subscription themselves.
- sub_self_service_add_fixed_pricenumber (float)
  Fixed price charged when members add the subscription themselves.
- sub_self_service_delete_fixed_pricenumber (float)
  Fixed price charged when members cancel the subscription themselves.
- sub_pre_paidboolean
  Whether the subscription is paid in advance.
- sub_only_billed_after_startboolean
  Whether the subscription is only billed after its start date.
- sub_people_age_group_oneinteger
  Upper age limit of age group one.
- sub_people_age_group_one_discountinteger
  Discount in percent for age group one.
- sub_people_age_group_one_freeinteger
  Number of free places for age group one.
- sub_people_age_group_twointeger
  Upper age limit of age group two.
- sub_people_age_group_two_discountinteger
  Discount in percent for age group two.
- sub_people_age_group_two_freeinteger
  Number of free places for age group two.
- sub_people_age_group_threeinteger
  Upper age limit of age group three.
- sub_people_age_group_three_discountinteger
  Discount in percent for age group three.
- sub_people_age_group_three_freeinteger
  Number of free places for age group three.
- sub_people_age_group_fourinteger
  Upper age limit of age group four.
- sub_people_age_group_four_discountinteger
  Discount in percent for age group four.
- sub_people_age_group_four_freeinteger
  Number of free places for age group four.
- price_is_bruttoboolean
  Whether the prices are gross prices including tax.
- skustring
  Artikelnummer (Stock Keeping Unit)
- barcodestring
  Barcode (ISBN, UPC, GTIN usw.)
- companyCRMCompany
  Company the billing item belongs to.
- parentPredefinedBillingItem11
  Parent billing item, for example for variants.
- is_preferredboolean
  The item is preferred and shown first.
- is_defaultboolean
  The item is the default for its type.
- is_discountboolean
  The item is a discount.
- is_freeboolean
  The item is free of charge.
- is_passiveboolean
  The item is passive and cannot be selected anymore.
- is_globalboolean
  The item is available for all companies.
- inventory_countinteger
  Number of pieces in stock, if the item is a product.
- stock_itemboolean
  This is flag for items that can be ordered at any time
- producer_guarantee_yearsnumber (float)
  Herstellergarantie in Jahren (ganze Jahre oder ,5-Schritte, siehe ProductGuaranteeYears). Grundlage fuer das EU GARAN Label (nur bei Garantie > 2 Jahre zulaessig). Producer guarantee of durability in years (whole or .5 steps), basis for the EU GARAN label.
- producer_brandstring
  Hersteller / Marke, die die Haltbarkeitsgarantie gibt - editierbares Feld "Brand/Trademark" des EU GARAN Labels. Producer / brand offering the commercial guarantee of durability.
- energy_label_attachmentAttachment10
  Energielabel (EU Energieverbrauchskennzeichnung) als Bild/PDF fuer Shop, Warenkorb und Mail. EU energy label image/PDF of this product.
- garan_label_attachmentAttachment10
  Grosses EU GARAN Label (DVO 2025/1960): kostenlose Haltbarkeitsgarantie des Herstellers von mehr als zwei Jahren, mit Jahren, Marke und Modell. Full EU GARAN label (commercial guarantee of durability > 2 years).
- garan_label_pictogram_attachmentAttachment10
  "Nested label" / Piktogramm des EU GARAN Labels: zeigt nur die Jahre, beim Klick/Hover muss das grosse Label (garanLabelAttachment) erscheinen. EU GARAN "nested label" pictogram showing only the years; links to the full label online.
- public_categorystring
  Category of the item shown publicly.
- condition_booking_content_typeBookingContentType17
  Item applies only to bookings with this content type (e.g. flight type). Null = all content types.
- usage_time_baseinteger
  Section time pair used for usage billing: BaseBookingRealUsage::BILLING_TYPE_BLOCK_TIME or BILLING_TYPE_FLIGHT_TIME. Null = follow the usage record's billingType.
- base_locationBaseLocation10
  Location this charge belongs to (e.g. airport landing/takeoff fee), category CATEGORY_LOCATION
- condition_day_of_week_maskinteger
  Day-of-week bitmask (Mon=1 ... Sun=64, see DayOfWeekBitmaskHelper). Null = every day.
- condition_first_usage_onlyboolean
  Charge applies only once per usage record (first matching section, quantity 1)
- budget_grant_countinteger
  Number of event sign-ups this product grants when purchased (null = no budget)
- budget_create_onceboolean
  If true, budget is only created once per person+product combination. For recurring subscriptions: monthly payment but yearly budget.
- ticket_quotainteger
  Ticketverkauf (BaseEvent::isTicketSalesEnabled): Kontingent dieser Ticketart (Event-Preis). Null = nur das Teilnehmerlimit des Events zählt.
- ticket_sale_startstring (date-time)
  Ticketverkauf: Verkaufsstart dieser Ticketart (z. B. Frühbucher ab), null = sofort.
- ticket_sale_endstring (date-time)
  Ticketverkauf: Verkaufsende dieser Ticketart (z. B. Frühbucher bis), null = bis zum Anmeldeschluss.
- ticket_seat_zonestring
  Ticketverkauf mit Sitzplan: Diese Ticketart gilt nur für Plätze dieser Preiszone (BaseLocationPlanItem::seatZone), null = für jeden Platz.
- cancellation_term_unitstring
  Allowed cancellation terms for this subscription product. Null / empty = inherit the club default from settings. See CancellationTermCalculator::TERM_UNITS.
- cancellation_term_datesstring
  Comma separated list of fixed cancellation dates in DD.MM format, e.g. "31.03,30.06,30.09,31.12". Only used when cancellationTermUnit is CUSTOM.
- cancellation_notice_valueinteger
  Numeric value of the notice period before the cancellation term. Null = inherit from settings.
- cancellation_notice_unitstring
  Unit of the notice period: DAYS, WEEKS or MONTHS. Null = inherit from settings.
- … 6 more fields
deletedboolean
This property is used to mark an entity as deleted / archived

Request

curl --request GET \
  --url https://your-instance.iw-erp.de/api/invoice/bill_reminder \
  --header 'x-iw-jwt-token: <TOKEN>'

const options = {method: 'GET', headers: {'x-iw-jwt-token': '<TOKEN>'}};

fetch('https://your-instance.iw-erp.de/api/invoice/bill_reminder', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://your-instance.iw-erp.de/api/invoice/bill_reminder"

headers = {"x-iw-jwt-token": "<TOKEN>"}

response = requests.get(url, headers=headers)

print(response.text)

<?php
require_once('vendor/autoload.php');

$client = new \GuzzleHttp\Client();

$response = $client->request('GET', 'https://your-instance.iw-erp.de/api/invoice/bill_reminder', [
  'headers' => [
    'x-iw-jwt-token' => '<TOKEN>',
  ],
]);

echo $response->getBody();

using System.Net.Http.Headers;
var client = new HttpClient();
var request = new HttpRequestMessage
{
  Method = HttpMethod.Get,
  RequestUri = new Uri("https://your-instance.iw-erp.de/api/invoice/bill_reminder"),
  Headers =
  {
    { "x-iw-jwt-token", "<TOKEN>" },
  },
};
using (var response = await client.SendAsync(request))
{
  response.EnsureSuccessStatusCode();
  var body = await response.Content.ReadAsStringAsync();
  Console.WriteLine(body);
}

OkHttpClient client = new OkHttpClient();

Request request = new Request.Builder()
  .url("https://your-instance.iw-erp.de/api/invoice/bill_reminder")
  .get()
  .addHeader("x-iw-jwt-token", "<TOKEN>")
  .build();

Response response = client.newCall(request).execute();

package main

import (
	"fmt"
	"net/http"
	"io"
)

func main() {

	url := "https://your-instance.iw-erp.de/api/invoice/bill_reminder"

	req, _ := http.NewRequest("GET", url, nil)

	req.Header.Add("x-iw-jwt-token", "<TOKEN>")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

Dart with the iw_erp_api package

import 'package:iw_erp_api/clients/billing_bill_reminder_controller.dart';
import 'package:iw_erp_api/logic/iw_api_state.dart';

IwApiState().host = 'your-instance.iw-erp.de';
IwApiState().currentJwtApiToken = '<TOKEN>';

final result = await BillingBillReminderController.getAll();
if (result.success) {
  print(result.data);
}

Response 200 application/json

[
  {
    "id": 42,
    "name": "Beispiel",
    "global_default": true,
    "bill_reminder_count": 1,
    "template": {
      "id": "42",
      "name": "Beispiel",
      "predefined": true,
      "data_type": "string",
      "data_type_label": "string",
      "template_mode": "string",
      "last_check_status": "string",
      "tag": "string",
      "mass_message": true,
      "default_store_as_pdf": true
    },
    "predefined_billing_item": {
      "name": "Beispiel",
      "description": "Text",
      "id": 42,
      "internal_description": "Text",
      "fixed_hours": 1.5,
      "fixed_price": 49.9,
      "fixed_price_base_unit": 49.9,
      "price_fixed_hours": 49.9,
      "price_additional_hours": 49.9,
      "name_additional_hours": "string"
    },
    "deleted": true
  }
]

Add a new BillReminder

POST/api/invoice/bill_reminder

Request body application/json

dataBillReminder2
Show fields (5)
- idinteger
  Primary key of the bill reminder. Internal ID.
- namestring
  Name of the reminder level, for example first reminder.
- global_defaultboolean
  Default reminder for all companies.
- bill_reminder_countinteger
  Level of the reminder, starting at 1.
- deletedboolean
  This property is used to mark an entity as deleted / archived

Responses

200Add a new BillReminderBillReminder

Show fields (7)

idinteger
Primary key of the bill reminder. Internal ID.
namestring
Name of the reminder level, for example first reminder.
global_defaultboolean
Default reminder for all companies.
bill_reminder_countinteger
Level of the reminder, starting at 1.
templateFlexibleLatexTemplate
Document template of the reminder.
Show fields (35)
- predefinedboolean
  True for templates shipped by the servercontrolpanel (PredefinedFlexibleTemplateMap). Their IDs are referenced by code, so the UI offers to duplicate ("Vorlage anpassen") instead of editing them.
- data_typestring
  Data type (reference class key) the template is rendered and checked with. For predefined templates (tag IW_PFLT) this is the data type of the code that uses them.
- data_type_labelstring
  Human readable name of the assigned data type, null for tags that are not a known data type.
- template_modestring
  Serialized mode so clients do not have to know that null means standard.
- last_check_statusstring
  Summary of the last template check for list views, the full result is admin detail only.
- idstring
  Primary key of the template. Internal ID. Used as a string identifier.
- namestring
  Name of the template.
- tagstring
  Tag used to group templates.
- mass_messageboolean
  Whether the template is used for mass messages.
- default_store_as_pdfboolean
  Whether the generated document is stored as PDF by default.
- security_scopestring
  Scope that controls who can use the template.
- security_user_access_typeinteger
  Access type required to use the template.
- param1string
  Value of parameter 1 used in the template.
- param2string
  Value of parameter 2 used in the template.
- param3string
  Value of parameter 3 used in the template.
- param4string
  Value of parameter 4 used in the template.
- param5string
  Value of parameter 5 used in the template.
- param6string
  Value of parameter 6 used in the template.
- param7string
  Value of parameter 7 used in the template.
- param8string
  Value of parameter 8 used in the template.
- param9string
  Value of parameter 9 used in the template.
- param10string
  Value of parameter 10 used in the template.
- default_value_param1string
  Default value of parameter 1.
- default_value_param2string
  Default value of parameter 2.
- default_value_param3string
  Default value of parameter 3.
- default_value_param4string
  Default value of parameter 4.
- default_value_param5string
  Default value of parameter 5.
- default_value_param6string
  Default value of parameter 6.
- default_value_param7string
  Default value of parameter 7.
- default_value_param8string
  Default value of parameter 8.
- default_value_param9string
  Default value of parameter 9.
- default_value_param10string
  Default value of parameter 10.
- deletedboolean
  This property is used to mark an entity as deleted / archived
- createdstring (date-time)
  Point in time the entity was created.
- updatedstring (date-time)
  Point in time the entity was last updated.
predefined_billing_itemPredefinedBillingItem11
Billing item charged with the reminder fee.
Show fields (81)
- idinteger
  Primary key of the mapped billing item. Internal ID.
- namestringrequired
  Name of the billing item.
- descriptionstringrequired
  Description of the billing item shown to the customer.
- internal_descriptionstring
  Internal description of the billing item, not shown to the customer.
- fixed_hoursnumber (float)
  Fixed number of hours billed.
- fixed_pricenumber (float)
  Fixed price billed.
- fixed_price_base_unitnumber (float)
  Base unit for the fixed price.
- price_fixed_hoursnumber (float)
  Price for the fixed hours.
- price_additional_hoursnumber (float)
  Price for each additional hour.
- name_additional_hoursstring
  Name of the additional hours item.
- description_additional_hoursstring
  Description of the additional hours item.
- time_billed_on_ticket_closeboolean
  Whether the time is billed when the ticket is closed.
- billing_typeBillingItemType
  Billing item type.
- buying_pricenumber (float)
  Purchase price of the item.
- recurrenceCRMRecurrence
  Recurrence the billing item follows.
- deletedboolean
  Whether the billing item is deleted.
- condition_date_afterstring (date-time)
  The item applies only to dates after this date.
- condition_date_beforestring (date-time)
  The item applies only to dates before this date.
- condition_country_codestring
  Country code the item applies to.
- condition_zip_code_fromstring
  Start of the postal code range the item applies to.
- condition_zip_code_tostring
  End of the postal code range the item applies to.
- condition_time_after_hourinteger
  The item applies only after this hour of the day.
- condition_max_lengthinteger
  Maximum length the item applies to.
- condition_time_before_hourinteger
  The item applies only before this hour of the day.
- condition_sub_access_tagAccessTag
  Access tag a subscription must have for the item to apply.
- condition_show_despite_missing_access_tagboolean
  Whether the item is shown even if the access tag is missing.
- condition_sub_free_logicstring
  Free-form condition logic for the subscription.
- fixed_price_logicstring
  Free-form logic that calculates the fixed price.
- sub_self_service_addboolean
  Whether members can add the subscription themselves.
- sub_self_service_deleteboolean
  Whether members can cancel the subscription themselves.
- sub_self_service_add_fixed_pricenumber (float)
  Fixed price charged when members add the subscription themselves.
- sub_self_service_delete_fixed_pricenumber (float)
  Fixed price charged when members cancel the subscription themselves.
- sub_pre_paidboolean
  Whether the subscription is paid in advance.
- sub_only_billed_after_startboolean
  Whether the subscription is only billed after its start date.
- sub_people_age_group_oneinteger
  Upper age limit of age group one.
- sub_people_age_group_one_discountinteger
  Discount in percent for age group one.
- sub_people_age_group_one_freeinteger
  Number of free places for age group one.
- sub_people_age_group_twointeger
  Upper age limit of age group two.
- sub_people_age_group_two_discountinteger
  Discount in percent for age group two.
- sub_people_age_group_two_freeinteger
  Number of free places for age group two.
- sub_people_age_group_threeinteger
  Upper age limit of age group three.
- sub_people_age_group_three_discountinteger
  Discount in percent for age group three.
- sub_people_age_group_three_freeinteger
  Number of free places for age group three.
- sub_people_age_group_fourinteger
  Upper age limit of age group four.
- sub_people_age_group_four_discountinteger
  Discount in percent for age group four.
- sub_people_age_group_four_freeinteger
  Number of free places for age group four.
- price_is_bruttoboolean
  Whether the prices are gross prices including tax.
- skustring
  Artikelnummer (Stock Keeping Unit)
- barcodestring
  Barcode (ISBN, UPC, GTIN usw.)
- companyCRMCompany
  Company the billing item belongs to.
- parentPredefinedBillingItem11
  Parent billing item, for example for variants.
- is_preferredboolean
  The item is preferred and shown first.
- is_defaultboolean
  The item is the default for its type.
- is_discountboolean
  The item is a discount.
- is_freeboolean
  The item is free of charge.
- is_passiveboolean
  The item is passive and cannot be selected anymore.
- is_globalboolean
  The item is available for all companies.
- inventory_countinteger
  Number of pieces in stock, if the item is a product.
- stock_itemboolean
  This is flag for items that can be ordered at any time
- producer_guarantee_yearsnumber (float)
  Herstellergarantie in Jahren (ganze Jahre oder ,5-Schritte, siehe ProductGuaranteeYears). Grundlage fuer das EU GARAN Label (nur bei Garantie > 2 Jahre zulaessig). Producer guarantee of durability in years (whole or .5 steps), basis for the EU GARAN label.
- producer_brandstring
  Hersteller / Marke, die die Haltbarkeitsgarantie gibt - editierbares Feld "Brand/Trademark" des EU GARAN Labels. Producer / brand offering the commercial guarantee of durability.
- energy_label_attachmentAttachment10
  Energielabel (EU Energieverbrauchskennzeichnung) als Bild/PDF fuer Shop, Warenkorb und Mail. EU energy label image/PDF of this product.
- garan_label_attachmentAttachment10
  Grosses EU GARAN Label (DVO 2025/1960): kostenlose Haltbarkeitsgarantie des Herstellers von mehr als zwei Jahren, mit Jahren, Marke und Modell. Full EU GARAN label (commercial guarantee of durability > 2 years).
- garan_label_pictogram_attachmentAttachment10
  "Nested label" / Piktogramm des EU GARAN Labels: zeigt nur die Jahre, beim Klick/Hover muss das grosse Label (garanLabelAttachment) erscheinen. EU GARAN "nested label" pictogram showing only the years; links to the full label online.
- public_categorystring
  Category of the item shown publicly.
- condition_booking_content_typeBookingContentType17
  Item applies only to bookings with this content type (e.g. flight type). Null = all content types.
- usage_time_baseinteger
  Section time pair used for usage billing: BaseBookingRealUsage::BILLING_TYPE_BLOCK_TIME or BILLING_TYPE_FLIGHT_TIME. Null = follow the usage record's billingType.
- base_locationBaseLocation10
  Location this charge belongs to (e.g. airport landing/takeoff fee), category CATEGORY_LOCATION
- condition_day_of_week_maskinteger
  Day-of-week bitmask (Mon=1 ... Sun=64, see DayOfWeekBitmaskHelper). Null = every day.
- condition_first_usage_onlyboolean
  Charge applies only once per usage record (first matching section, quantity 1)
- budget_grant_countinteger
  Number of event sign-ups this product grants when purchased (null = no budget)
- budget_create_onceboolean
  If true, budget is only created once per person+product combination. For recurring subscriptions: monthly payment but yearly budget.
- ticket_quotainteger
  Ticketverkauf (BaseEvent::isTicketSalesEnabled): Kontingent dieser Ticketart (Event-Preis). Null = nur das Teilnehmerlimit des Events zählt.
- ticket_sale_startstring (date-time)
  Ticketverkauf: Verkaufsstart dieser Ticketart (z. B. Frühbucher ab), null = sofort.
- ticket_sale_endstring (date-time)
  Ticketverkauf: Verkaufsende dieser Ticketart (z. B. Frühbucher bis), null = bis zum Anmeldeschluss.
- ticket_seat_zonestring
  Ticketverkauf mit Sitzplan: Diese Ticketart gilt nur für Plätze dieser Preiszone (BaseLocationPlanItem::seatZone), null = für jeden Platz.
- cancellation_term_unitstring
  Allowed cancellation terms for this subscription product. Null / empty = inherit the club default from settings. See CancellationTermCalculator::TERM_UNITS.
- cancellation_term_datesstring
  Comma separated list of fixed cancellation dates in DD.MM format, e.g. "31.03,30.06,30.09,31.12". Only used when cancellationTermUnit is CUSTOM.
- cancellation_notice_valueinteger
  Numeric value of the notice period before the cancellation term. Null = inherit from settings.
- cancellation_notice_unitstring
  Unit of the notice period: DAYS, WEEKS or MONTHS. Null = inherit from settings.
- … 6 more fields
deletedboolean
This property is used to mark an entity as deleted / archived

Request

curl --request POST \
  --url https://your-instance.iw-erp.de/api/invoice/bill_reminder \
  --header 'content-type: application/json' \
  --header 'x-iw-jwt-token: <TOKEN>' \
  --data '
{
  "data": {
    "id": 42,
    "name": "Beispiel",
    "global_default": true,
    "bill_reminder_count": 1,
    "deleted": true
  }
}
'

const options = {
  method: 'POST',
  headers: {'x-iw-jwt-token': '<TOKEN>', 'content-type': 'application/json'},
  body: JSON.stringify({
    data: {
      id: 42,
      name: 'Beispiel',
      global_default: true,
      bill_reminder_count: 1,
      deleted: true
    }
  })
};

fetch('https://your-instance.iw-erp.de/api/invoice/bill_reminder', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://your-instance.iw-erp.de/api/invoice/bill_reminder"

payload = { "data": {
    "id": 42,
    "name": "Beispiel",
    "global_default": True,
    "bill_reminder_count": 1,
    "deleted": True
  } }
headers = {
  "x-iw-jwt-token": "<TOKEN>",
  "content-type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

<?php
require_once('vendor/autoload.php');

$client = new \GuzzleHttp\Client();

$response = $client->request('POST', 'https://your-instance.iw-erp.de/api/invoice/bill_reminder', [
  'body' => '{"data":{"id":42,"name":"Beispiel","global_default":true,"bill_reminder_count":1,"deleted":true}}',
  'headers' => [
    'content-type' => 'application/json',
    'x-iw-jwt-token' => '<TOKEN>',
  ],
]);

echo $response->getBody();

using System.Net.Http.Headers;
var client = new HttpClient();
var request = new HttpRequestMessage
{
  Method = HttpMethod.Post,
  RequestUri = new Uri("https://your-instance.iw-erp.de/api/invoice/bill_reminder"),
  Headers =
  {
    { "x-iw-jwt-token", "<TOKEN>" },
  },
  Content = new StringContent("{\"data\":{\"id\":42,\"name\":\"Beispiel\",\"global_default\":true,\"bill_reminder_count\":1,\"deleted\":true}}")
  {
    Headers =
    {
      ContentType = new MediaTypeHeaderValue("application/json")
    }
  }
};
using (var response = await client.SendAsync(request))
{
  response.EnsureSuccessStatusCode();
  var body = await response.Content.ReadAsStringAsync();
  Console.WriteLine(body);
}

OkHttpClient client = new OkHttpClient();

MediaType mediaType = MediaType.parse("application/json");
RequestBody body = RequestBody.create(mediaType, "{\"data\":{\"id\":42,\"name\":\"Beispiel\",\"global_default\":true,\"bill_reminder_count\":1,\"deleted\":true}}");
Request request = new Request.Builder()
  .url("https://your-instance.iw-erp.de/api/invoice/bill_reminder")
  .post(body)
  .addHeader("x-iw-jwt-token", "<TOKEN>")
  .addHeader("content-type", "application/json")
  .build();

Response response = client.newCall(request).execute();

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://your-instance.iw-erp.de/api/invoice/bill_reminder"

	payload := strings.NewReader("{\"data\":{\"id\":42,\"name\":\"Beispiel\",\"global_default\":true,\"bill_reminder_count\":1,\"deleted\":true}}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("x-iw-jwt-token", "<TOKEN>")
	req.Header.Add("content-type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

Dart with the iw_erp_api package

import 'package:iw_erp_api/clients/billing_bill_reminder_controller.dart';
import 'package:iw_erp_api/logic/iw_api_state.dart';
import 'package:iw_erp_api/model/bill_reminder.dart';

IwApiState().host = 'your-instance.iw-erp.de';
IwApiState().currentJwtApiToken = '<TOKEN>';

final result = await BillingBillReminderController.post(BillReminder.fromJson({
  "id": 42,
  "name": "Beispiel",
  "global_default": true,
  "bill_reminder_count": 1,
  "deleted": true
}));
if (result.success) {
  print(result.data);
}

Response 200 application/json

{
  "id": 42,
  "name": "Beispiel",
  "global_default": true,
  "bill_reminder_count": 1,
  "template": {
    "id": "42",
    "name": "Beispiel",
    "predefined": true,
    "data_type": "string",
    "data_type_label": "string",
    "template_mode": "string",
    "last_check_status": "string",
    "tag": "string",
    "mass_message": true,
    "default_store_as_pdf": true
  },
  "predefined_billing_item": {
    "name": "Beispiel",
    "description": "Text",
    "id": 42,
    "internal_description": "Text",
    "fixed_hours": 1.5,
    "fixed_price": 49.9,
    "fixed_price_base_unit": 49.9,
    "price_fixed_hours": 49.9,
    "price_additional_hours": 49.9,
    "name_additional_hours": "string"
  },
  "deleted": true
}

Get a single BillReminder

GET/api/invoice/bill_reminder/{identifier}

Path parameters

identifierrequiredstring

Responses

200Get a single BillReminderBillReminder

Show fields (7)

idinteger
Primary key of the bill reminder. Internal ID.
namestring
Name of the reminder level, for example first reminder.
global_defaultboolean
Default reminder for all companies.
bill_reminder_countinteger
Level of the reminder, starting at 1.
templateFlexibleLatexTemplate
Document template of the reminder.
Show fields (35)
- predefinedboolean
  True for templates shipped by the servercontrolpanel (PredefinedFlexibleTemplateMap). Their IDs are referenced by code, so the UI offers to duplicate ("Vorlage anpassen") instead of editing them.
- data_typestring
  Data type (reference class key) the template is rendered and checked with. For predefined templates (tag IW_PFLT) this is the data type of the code that uses them.
- data_type_labelstring
  Human readable name of the assigned data type, null for tags that are not a known data type.
- template_modestring
  Serialized mode so clients do not have to know that null means standard.
- last_check_statusstring
  Summary of the last template check for list views, the full result is admin detail only.
- idstring
  Primary key of the template. Internal ID. Used as a string identifier.
- namestring
  Name of the template.
- tagstring
  Tag used to group templates.
- mass_messageboolean
  Whether the template is used for mass messages.
- default_store_as_pdfboolean
  Whether the generated document is stored as PDF by default.
- security_scopestring
  Scope that controls who can use the template.
- security_user_access_typeinteger
  Access type required to use the template.
- param1string
  Value of parameter 1 used in the template.
- param2string
  Value of parameter 2 used in the template.
- param3string
  Value of parameter 3 used in the template.
- param4string
  Value of parameter 4 used in the template.
- param5string
  Value of parameter 5 used in the template.
- param6string
  Value of parameter 6 used in the template.
- param7string
  Value of parameter 7 used in the template.
- param8string
  Value of parameter 8 used in the template.
- param9string
  Value of parameter 9 used in the template.
- param10string
  Value of parameter 10 used in the template.
- default_value_param1string
  Default value of parameter 1.
- default_value_param2string
  Default value of parameter 2.
- default_value_param3string
  Default value of parameter 3.
- default_value_param4string
  Default value of parameter 4.
- default_value_param5string
  Default value of parameter 5.
- default_value_param6string
  Default value of parameter 6.
- default_value_param7string
  Default value of parameter 7.
- default_value_param8string
  Default value of parameter 8.
- default_value_param9string
  Default value of parameter 9.
- default_value_param10string
  Default value of parameter 10.
- deletedboolean
  This property is used to mark an entity as deleted / archived
- createdstring (date-time)
  Point in time the entity was created.
- updatedstring (date-time)
  Point in time the entity was last updated.
predefined_billing_itemPredefinedBillingItem11
Billing item charged with the reminder fee.
Show fields (81)
- idinteger
  Primary key of the mapped billing item. Internal ID.
- namestringrequired
  Name of the billing item.
- descriptionstringrequired
  Description of the billing item shown to the customer.
- internal_descriptionstring
  Internal description of the billing item, not shown to the customer.
- fixed_hoursnumber (float)
  Fixed number of hours billed.
- fixed_pricenumber (float)
  Fixed price billed.
- fixed_price_base_unitnumber (float)
  Base unit for the fixed price.
- price_fixed_hoursnumber (float)
  Price for the fixed hours.
- price_additional_hoursnumber (float)
  Price for each additional hour.
- name_additional_hoursstring
  Name of the additional hours item.
- description_additional_hoursstring
  Description of the additional hours item.
- time_billed_on_ticket_closeboolean
  Whether the time is billed when the ticket is closed.
- billing_typeBillingItemType
  Billing item type.
- buying_pricenumber (float)
  Purchase price of the item.
- recurrenceCRMRecurrence
  Recurrence the billing item follows.
- deletedboolean
  Whether the billing item is deleted.
- condition_date_afterstring (date-time)
  The item applies only to dates after this date.
- condition_date_beforestring (date-time)
  The item applies only to dates before this date.
- condition_country_codestring
  Country code the item applies to.
- condition_zip_code_fromstring
  Start of the postal code range the item applies to.
- condition_zip_code_tostring
  End of the postal code range the item applies to.
- condition_time_after_hourinteger
  The item applies only after this hour of the day.
- condition_max_lengthinteger
  Maximum length the item applies to.
- condition_time_before_hourinteger
  The item applies only before this hour of the day.
- condition_sub_access_tagAccessTag
  Access tag a subscription must have for the item to apply.
- condition_show_despite_missing_access_tagboolean
  Whether the item is shown even if the access tag is missing.
- condition_sub_free_logicstring
  Free-form condition logic for the subscription.
- fixed_price_logicstring
  Free-form logic that calculates the fixed price.
- sub_self_service_addboolean
  Whether members can add the subscription themselves.
- sub_self_service_deleteboolean
  Whether members can cancel the subscription themselves.
- sub_self_service_add_fixed_pricenumber (float)
  Fixed price charged when members add the subscription themselves.
- sub_self_service_delete_fixed_pricenumber (float)
  Fixed price charged when members cancel the subscription themselves.
- sub_pre_paidboolean
  Whether the subscription is paid in advance.
- sub_only_billed_after_startboolean
  Whether the subscription is only billed after its start date.
- sub_people_age_group_oneinteger
  Upper age limit of age group one.
- sub_people_age_group_one_discountinteger
  Discount in percent for age group one.
- sub_people_age_group_one_freeinteger
  Number of free places for age group one.
- sub_people_age_group_twointeger
  Upper age limit of age group two.
- sub_people_age_group_two_discountinteger
  Discount in percent for age group two.
- sub_people_age_group_two_freeinteger
  Number of free places for age group two.
- sub_people_age_group_threeinteger
  Upper age limit of age group three.
- sub_people_age_group_three_discountinteger
  Discount in percent for age group three.
- sub_people_age_group_three_freeinteger
  Number of free places for age group three.
- sub_people_age_group_fourinteger
  Upper age limit of age group four.
- sub_people_age_group_four_discountinteger
  Discount in percent for age group four.
- sub_people_age_group_four_freeinteger
  Number of free places for age group four.
- price_is_bruttoboolean
  Whether the prices are gross prices including tax.
- skustring
  Artikelnummer (Stock Keeping Unit)
- barcodestring
  Barcode (ISBN, UPC, GTIN usw.)
- companyCRMCompany
  Company the billing item belongs to.
- parentPredefinedBillingItem11
  Parent billing item, for example for variants.
- is_preferredboolean
  The item is preferred and shown first.
- is_defaultboolean
  The item is the default for its type.
- is_discountboolean
  The item is a discount.
- is_freeboolean
  The item is free of charge.
- is_passiveboolean
  The item is passive and cannot be selected anymore.
- is_globalboolean
  The item is available for all companies.
- inventory_countinteger
  Number of pieces in stock, if the item is a product.
- stock_itemboolean
  This is flag for items that can be ordered at any time
- producer_guarantee_yearsnumber (float)
  Herstellergarantie in Jahren (ganze Jahre oder ,5-Schritte, siehe ProductGuaranteeYears). Grundlage fuer das EU GARAN Label (nur bei Garantie > 2 Jahre zulaessig). Producer guarantee of durability in years (whole or .5 steps), basis for the EU GARAN label.
- producer_brandstring
  Hersteller / Marke, die die Haltbarkeitsgarantie gibt - editierbares Feld "Brand/Trademark" des EU GARAN Labels. Producer / brand offering the commercial guarantee of durability.
- energy_label_attachmentAttachment10
  Energielabel (EU Energieverbrauchskennzeichnung) als Bild/PDF fuer Shop, Warenkorb und Mail. EU energy label image/PDF of this product.
- garan_label_attachmentAttachment10
  Grosses EU GARAN Label (DVO 2025/1960): kostenlose Haltbarkeitsgarantie des Herstellers von mehr als zwei Jahren, mit Jahren, Marke und Modell. Full EU GARAN label (commercial guarantee of durability > 2 years).
- garan_label_pictogram_attachmentAttachment10
  "Nested label" / Piktogramm des EU GARAN Labels: zeigt nur die Jahre, beim Klick/Hover muss das grosse Label (garanLabelAttachment) erscheinen. EU GARAN "nested label" pictogram showing only the years; links to the full label online.
- public_categorystring
  Category of the item shown publicly.
- condition_booking_content_typeBookingContentType17
  Item applies only to bookings with this content type (e.g. flight type). Null = all content types.
- usage_time_baseinteger
  Section time pair used for usage billing: BaseBookingRealUsage::BILLING_TYPE_BLOCK_TIME or BILLING_TYPE_FLIGHT_TIME. Null = follow the usage record's billingType.
- base_locationBaseLocation10
  Location this charge belongs to (e.g. airport landing/takeoff fee), category CATEGORY_LOCATION
- condition_day_of_week_maskinteger
  Day-of-week bitmask (Mon=1 ... Sun=64, see DayOfWeekBitmaskHelper). Null = every day.
- condition_first_usage_onlyboolean
  Charge applies only once per usage record (first matching section, quantity 1)
- budget_grant_countinteger
  Number of event sign-ups this product grants when purchased (null = no budget)
- budget_create_onceboolean
  If true, budget is only created once per person+product combination. For recurring subscriptions: monthly payment but yearly budget.
- ticket_quotainteger
  Ticketverkauf (BaseEvent::isTicketSalesEnabled): Kontingent dieser Ticketart (Event-Preis). Null = nur das Teilnehmerlimit des Events zählt.
- ticket_sale_startstring (date-time)
  Ticketverkauf: Verkaufsstart dieser Ticketart (z. B. Frühbucher ab), null = sofort.
- ticket_sale_endstring (date-time)
  Ticketverkauf: Verkaufsende dieser Ticketart (z. B. Frühbucher bis), null = bis zum Anmeldeschluss.
- ticket_seat_zonestring
  Ticketverkauf mit Sitzplan: Diese Ticketart gilt nur für Plätze dieser Preiszone (BaseLocationPlanItem::seatZone), null = für jeden Platz.
- cancellation_term_unitstring
  Allowed cancellation terms for this subscription product. Null / empty = inherit the club default from settings. See CancellationTermCalculator::TERM_UNITS.
- cancellation_term_datesstring
  Comma separated list of fixed cancellation dates in DD.MM format, e.g. "31.03,30.06,30.09,31.12". Only used when cancellationTermUnit is CUSTOM.
- cancellation_notice_valueinteger
  Numeric value of the notice period before the cancellation term. Null = inherit from settings.
- cancellation_notice_unitstring
  Unit of the notice period: DAYS, WEEKS or MONTHS. Null = inherit from settings.
- … 6 more fields
deletedboolean
This property is used to mark an entity as deleted / archived

Request

curl --request GET \
  --url https://your-instance.iw-erp.de/api/invoice/bill_reminder/42 \
  --header 'x-iw-jwt-token: <TOKEN>'

const options = {method: 'GET', headers: {'x-iw-jwt-token': '<TOKEN>'}};

fetch('https://your-instance.iw-erp.de/api/invoice/bill_reminder/42', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://your-instance.iw-erp.de/api/invoice/bill_reminder/42"

headers = {"x-iw-jwt-token": "<TOKEN>"}

response = requests.get(url, headers=headers)

print(response.text)

<?php
require_once('vendor/autoload.php');

$client = new \GuzzleHttp\Client();

$response = $client->request('GET', 'https://your-instance.iw-erp.de/api/invoice/bill_reminder/42', [
  'headers' => [
    'x-iw-jwt-token' => '<TOKEN>',
  ],
]);

echo $response->getBody();

using System.Net.Http.Headers;
var client = new HttpClient();
var request = new HttpRequestMessage
{
  Method = HttpMethod.Get,
  RequestUri = new Uri("https://your-instance.iw-erp.de/api/invoice/bill_reminder/42"),
  Headers =
  {
    { "x-iw-jwt-token", "<TOKEN>" },
  },
};
using (var response = await client.SendAsync(request))
{
  response.EnsureSuccessStatusCode();
  var body = await response.Content.ReadAsStringAsync();
  Console.WriteLine(body);
}

OkHttpClient client = new OkHttpClient();

Request request = new Request.Builder()
  .url("https://your-instance.iw-erp.de/api/invoice/bill_reminder/42")
  .get()
  .addHeader("x-iw-jwt-token", "<TOKEN>")
  .build();

Response response = client.newCall(request).execute();

package main

import (
	"fmt"
	"net/http"
	"io"
)

func main() {

	url := "https://your-instance.iw-erp.de/api/invoice/bill_reminder/42"

	req, _ := http.NewRequest("GET", url, nil)

	req.Header.Add("x-iw-jwt-token", "<TOKEN>")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

Dart with the iw_erp_api package

import 'package:iw_erp_api/clients/billing_bill_reminder_controller.dart';
import 'package:iw_erp_api/logic/iw_api_state.dart';

IwApiState().host = 'your-instance.iw-erp.de';
IwApiState().currentJwtApiToken = '<TOKEN>';

final result = await BillingBillReminderController.get('42');
if (result.success) {
  print(result.data);
}

Response 200 application/json

{
  "id": 42,
  "name": "Beispiel",
  "global_default": true,
  "bill_reminder_count": 1,
  "template": {
    "id": "42",
    "name": "Beispiel",
    "predefined": true,
    "data_type": "string",
    "data_type_label": "string",
    "template_mode": "string",
    "last_check_status": "string",
    "tag": "string",
    "mass_message": true,
    "default_store_as_pdf": true
  },
  "predefined_billing_item": {
    "name": "Beispiel",
    "description": "Text",
    "id": 42,
    "internal_description": "Text",
    "fixed_hours": 1.5,
    "fixed_price": 49.9,
    "fixed_price_base_unit": 49.9,
    "price_fixed_hours": 49.9,
    "price_additional_hours": 49.9,
    "name_additional_hours": "string"
  },
  "deleted": true
}

Update a BillReminder

PUT/api/invoice/bill_reminder/{identifier}

Path parameters

identifierrequiredstring

Request body application/json

dataBillReminder2
Show fields (5)
- idinteger
  Primary key of the bill reminder. Internal ID.
- namestring
  Name of the reminder level, for example first reminder.
- global_defaultboolean
  Default reminder for all companies.
- bill_reminder_countinteger
  Level of the reminder, starting at 1.
- deletedboolean
  This property is used to mark an entity as deleted / archived

Responses

200Update a BillReminderBillReminder

Show fields (7)

idinteger
Primary key of the bill reminder. Internal ID.
namestring
Name of the reminder level, for example first reminder.
global_defaultboolean
Default reminder for all companies.
bill_reminder_countinteger
Level of the reminder, starting at 1.
templateFlexibleLatexTemplate
Document template of the reminder.
Show fields (35)
- predefinedboolean
  True for templates shipped by the servercontrolpanel (PredefinedFlexibleTemplateMap). Their IDs are referenced by code, so the UI offers to duplicate ("Vorlage anpassen") instead of editing them.
- data_typestring
  Data type (reference class key) the template is rendered and checked with. For predefined templates (tag IW_PFLT) this is the data type of the code that uses them.
- data_type_labelstring
  Human readable name of the assigned data type, null for tags that are not a known data type.
- template_modestring
  Serialized mode so clients do not have to know that null means standard.
- last_check_statusstring
  Summary of the last template check for list views, the full result is admin detail only.
- idstring
  Primary key of the template. Internal ID. Used as a string identifier.
- namestring
  Name of the template.
- tagstring
  Tag used to group templates.
- mass_messageboolean
  Whether the template is used for mass messages.
- default_store_as_pdfboolean
  Whether the generated document is stored as PDF by default.
- security_scopestring
  Scope that controls who can use the template.
- security_user_access_typeinteger
  Access type required to use the template.
- param1string
  Value of parameter 1 used in the template.
- param2string
  Value of parameter 2 used in the template.
- param3string
  Value of parameter 3 used in the template.
- param4string
  Value of parameter 4 used in the template.
- param5string
  Value of parameter 5 used in the template.
- param6string
  Value of parameter 6 used in the template.
- param7string
  Value of parameter 7 used in the template.
- param8string
  Value of parameter 8 used in the template.
- param9string
  Value of parameter 9 used in the template.
- param10string
  Value of parameter 10 used in the template.
- default_value_param1string
  Default value of parameter 1.
- default_value_param2string
  Default value of parameter 2.
- default_value_param3string
  Default value of parameter 3.
- default_value_param4string
  Default value of parameter 4.
- default_value_param5string
  Default value of parameter 5.
- default_value_param6string
  Default value of parameter 6.
- default_value_param7string
  Default value of parameter 7.
- default_value_param8string
  Default value of parameter 8.
- default_value_param9string
  Default value of parameter 9.
- default_value_param10string
  Default value of parameter 10.
- deletedboolean
  This property is used to mark an entity as deleted / archived
- createdstring (date-time)
  Point in time the entity was created.
- updatedstring (date-time)
  Point in time the entity was last updated.
predefined_billing_itemPredefinedBillingItem11
Billing item charged with the reminder fee.
Show fields (81)
- idinteger
  Primary key of the mapped billing item. Internal ID.
- namestringrequired
  Name of the billing item.
- descriptionstringrequired
  Description of the billing item shown to the customer.
- internal_descriptionstring
  Internal description of the billing item, not shown to the customer.
- fixed_hoursnumber (float)
  Fixed number of hours billed.
- fixed_pricenumber (float)
  Fixed price billed.
- fixed_price_base_unitnumber (float)
  Base unit for the fixed price.
- price_fixed_hoursnumber (float)
  Price for the fixed hours.
- price_additional_hoursnumber (float)
  Price for each additional hour.
- name_additional_hoursstring
  Name of the additional hours item.
- description_additional_hoursstring
  Description of the additional hours item.
- time_billed_on_ticket_closeboolean
  Whether the time is billed when the ticket is closed.
- billing_typeBillingItemType
  Billing item type.
- buying_pricenumber (float)
  Purchase price of the item.
- recurrenceCRMRecurrence
  Recurrence the billing item follows.
- deletedboolean
  Whether the billing item is deleted.
- condition_date_afterstring (date-time)
  The item applies only to dates after this date.
- condition_date_beforestring (date-time)
  The item applies only to dates before this date.
- condition_country_codestring
  Country code the item applies to.
- condition_zip_code_fromstring
  Start of the postal code range the item applies to.
- condition_zip_code_tostring
  End of the postal code range the item applies to.
- condition_time_after_hourinteger
  The item applies only after this hour of the day.
- condition_max_lengthinteger
  Maximum length the item applies to.
- condition_time_before_hourinteger
  The item applies only before this hour of the day.
- condition_sub_access_tagAccessTag
  Access tag a subscription must have for the item to apply.
- condition_show_despite_missing_access_tagboolean
  Whether the item is shown even if the access tag is missing.
- condition_sub_free_logicstring
  Free-form condition logic for the subscription.
- fixed_price_logicstring
  Free-form logic that calculates the fixed price.
- sub_self_service_addboolean
  Whether members can add the subscription themselves.
- sub_self_service_deleteboolean
  Whether members can cancel the subscription themselves.
- sub_self_service_add_fixed_pricenumber (float)
  Fixed price charged when members add the subscription themselves.
- sub_self_service_delete_fixed_pricenumber (float)
  Fixed price charged when members cancel the subscription themselves.
- sub_pre_paidboolean
  Whether the subscription is paid in advance.
- sub_only_billed_after_startboolean
  Whether the subscription is only billed after its start date.
- sub_people_age_group_oneinteger
  Upper age limit of age group one.
- sub_people_age_group_one_discountinteger
  Discount in percent for age group one.
- sub_people_age_group_one_freeinteger
  Number of free places for age group one.
- sub_people_age_group_twointeger
  Upper age limit of age group two.
- sub_people_age_group_two_discountinteger
  Discount in percent for age group two.
- sub_people_age_group_two_freeinteger
  Number of free places for age group two.
- sub_people_age_group_threeinteger
  Upper age limit of age group three.
- sub_people_age_group_three_discountinteger
  Discount in percent for age group three.
- sub_people_age_group_three_freeinteger
  Number of free places for age group three.
- sub_people_age_group_fourinteger
  Upper age limit of age group four.
- sub_people_age_group_four_discountinteger
  Discount in percent for age group four.
- sub_people_age_group_four_freeinteger
  Number of free places for age group four.
- price_is_bruttoboolean
  Whether the prices are gross prices including tax.
- skustring
  Artikelnummer (Stock Keeping Unit)
- barcodestring
  Barcode (ISBN, UPC, GTIN usw.)
- companyCRMCompany
  Company the billing item belongs to.
- parentPredefinedBillingItem11
  Parent billing item, for example for variants.
- is_preferredboolean
  The item is preferred and shown first.
- is_defaultboolean
  The item is the default for its type.
- is_discountboolean
  The item is a discount.
- is_freeboolean
  The item is free of charge.
- is_passiveboolean
  The item is passive and cannot be selected anymore.
- is_globalboolean
  The item is available for all companies.
- inventory_countinteger
  Number of pieces in stock, if the item is a product.
- stock_itemboolean
  This is flag for items that can be ordered at any time
- producer_guarantee_yearsnumber (float)
  Herstellergarantie in Jahren (ganze Jahre oder ,5-Schritte, siehe ProductGuaranteeYears). Grundlage fuer das EU GARAN Label (nur bei Garantie > 2 Jahre zulaessig). Producer guarantee of durability in years (whole or .5 steps), basis for the EU GARAN label.
- producer_brandstring
  Hersteller / Marke, die die Haltbarkeitsgarantie gibt - editierbares Feld "Brand/Trademark" des EU GARAN Labels. Producer / brand offering the commercial guarantee of durability.
- energy_label_attachmentAttachment10
  Energielabel (EU Energieverbrauchskennzeichnung) als Bild/PDF fuer Shop, Warenkorb und Mail. EU energy label image/PDF of this product.
- garan_label_attachmentAttachment10
  Grosses EU GARAN Label (DVO 2025/1960): kostenlose Haltbarkeitsgarantie des Herstellers von mehr als zwei Jahren, mit Jahren, Marke und Modell. Full EU GARAN label (commercial guarantee of durability > 2 years).
- garan_label_pictogram_attachmentAttachment10
  "Nested label" / Piktogramm des EU GARAN Labels: zeigt nur die Jahre, beim Klick/Hover muss das grosse Label (garanLabelAttachment) erscheinen. EU GARAN "nested label" pictogram showing only the years; links to the full label online.
- public_categorystring
  Category of the item shown publicly.
- condition_booking_content_typeBookingContentType17
  Item applies only to bookings with this content type (e.g. flight type). Null = all content types.
- usage_time_baseinteger
  Section time pair used for usage billing: BaseBookingRealUsage::BILLING_TYPE_BLOCK_TIME or BILLING_TYPE_FLIGHT_TIME. Null = follow the usage record's billingType.
- base_locationBaseLocation10
  Location this charge belongs to (e.g. airport landing/takeoff fee), category CATEGORY_LOCATION
- condition_day_of_week_maskinteger
  Day-of-week bitmask (Mon=1 ... Sun=64, see DayOfWeekBitmaskHelper). Null = every day.
- condition_first_usage_onlyboolean
  Charge applies only once per usage record (first matching section, quantity 1)
- budget_grant_countinteger
  Number of event sign-ups this product grants when purchased (null = no budget)
- budget_create_onceboolean
  If true, budget is only created once per person+product combination. For recurring subscriptions: monthly payment but yearly budget.
- ticket_quotainteger
  Ticketverkauf (BaseEvent::isTicketSalesEnabled): Kontingent dieser Ticketart (Event-Preis). Null = nur das Teilnehmerlimit des Events zählt.
- ticket_sale_startstring (date-time)
  Ticketverkauf: Verkaufsstart dieser Ticketart (z. B. Frühbucher ab), null = sofort.
- ticket_sale_endstring (date-time)
  Ticketverkauf: Verkaufsende dieser Ticketart (z. B. Frühbucher bis), null = bis zum Anmeldeschluss.
- ticket_seat_zonestring
  Ticketverkauf mit Sitzplan: Diese Ticketart gilt nur für Plätze dieser Preiszone (BaseLocationPlanItem::seatZone), null = für jeden Platz.
- cancellation_term_unitstring
  Allowed cancellation terms for this subscription product. Null / empty = inherit the club default from settings. See CancellationTermCalculator::TERM_UNITS.
- cancellation_term_datesstring
  Comma separated list of fixed cancellation dates in DD.MM format, e.g. "31.03,30.06,30.09,31.12". Only used when cancellationTermUnit is CUSTOM.
- cancellation_notice_valueinteger
  Numeric value of the notice period before the cancellation term. Null = inherit from settings.
- cancellation_notice_unitstring
  Unit of the notice period: DAYS, WEEKS or MONTHS. Null = inherit from settings.
- … 6 more fields
deletedboolean
This property is used to mark an entity as deleted / archived

Request

curl --request PUT \
  --url https://your-instance.iw-erp.de/api/invoice/bill_reminder/42 \
  --header 'content-type: application/json' \
  --header 'x-iw-jwt-token: <TOKEN>' \
  --data '
{
  "data": {
    "id": 42,
    "name": "Beispiel",
    "global_default": true,
    "bill_reminder_count": 1,
    "deleted": true
  }
}
'

const options = {
  method: 'PUT',
  headers: {'x-iw-jwt-token': '<TOKEN>', 'content-type': 'application/json'},
  body: JSON.stringify({
    data: {
      id: 42,
      name: 'Beispiel',
      global_default: true,
      bill_reminder_count: 1,
      deleted: true
    }
  })
};

fetch('https://your-instance.iw-erp.de/api/invoice/bill_reminder/42', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://your-instance.iw-erp.de/api/invoice/bill_reminder/42"

payload = { "data": {
    "id": 42,
    "name": "Beispiel",
    "global_default": True,
    "bill_reminder_count": 1,
    "deleted": True
  } }
headers = {
  "x-iw-jwt-token": "<TOKEN>",
  "content-type": "application/json"
}

response = requests.put(url, json=payload, headers=headers)

print(response.text)

<?php
require_once('vendor/autoload.php');

$client = new \GuzzleHttp\Client();

$response = $client->request('PUT', 'https://your-instance.iw-erp.de/api/invoice/bill_reminder/42', [
  'body' => '{"data":{"id":42,"name":"Beispiel","global_default":true,"bill_reminder_count":1,"deleted":true}}',
  'headers' => [
    'content-type' => 'application/json',
    'x-iw-jwt-token' => '<TOKEN>',
  ],
]);

echo $response->getBody();

using System.Net.Http.Headers;
var client = new HttpClient();
var request = new HttpRequestMessage
{
  Method = HttpMethod.Put,
  RequestUri = new Uri("https://your-instance.iw-erp.de/api/invoice/bill_reminder/42"),
  Headers =
  {
    { "x-iw-jwt-token", "<TOKEN>" },
  },
  Content = new StringContent("{\"data\":{\"id\":42,\"name\":\"Beispiel\",\"global_default\":true,\"bill_reminder_count\":1,\"deleted\":true}}")
  {
    Headers =
    {
      ContentType = new MediaTypeHeaderValue("application/json")
    }
  }
};
using (var response = await client.SendAsync(request))
{
  response.EnsureSuccessStatusCode();
  var body = await response.Content.ReadAsStringAsync();
  Console.WriteLine(body);
}

OkHttpClient client = new OkHttpClient();

MediaType mediaType = MediaType.parse("application/json");
RequestBody body = RequestBody.create(mediaType, "{\"data\":{\"id\":42,\"name\":\"Beispiel\",\"global_default\":true,\"bill_reminder_count\":1,\"deleted\":true}}");
Request request = new Request.Builder()
  .url("https://your-instance.iw-erp.de/api/invoice/bill_reminder/42")
  .put(body)
  .addHeader("x-iw-jwt-token", "<TOKEN>")
  .addHeader("content-type", "application/json")
  .build();

Response response = client.newCall(request).execute();

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://your-instance.iw-erp.de/api/invoice/bill_reminder/42"

	payload := strings.NewReader("{\"data\":{\"id\":42,\"name\":\"Beispiel\",\"global_default\":true,\"bill_reminder_count\":1,\"deleted\":true}}")

	req, _ := http.NewRequest("PUT", url, payload)

	req.Header.Add("x-iw-jwt-token", "<TOKEN>")
	req.Header.Add("content-type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

Dart with the iw_erp_api package

import 'package:iw_erp_api/clients/billing_bill_reminder_controller.dart';
import 'package:iw_erp_api/logic/iw_api_state.dart';
import 'package:iw_erp_api/model/bill_reminder.dart';

IwApiState().host = 'your-instance.iw-erp.de';
IwApiState().currentJwtApiToken = '<TOKEN>';

final result = await BillingBillReminderController.put(BillReminder.fromJson({
  "id": 42,
  "name": "Beispiel",
  "global_default": true,
  "bill_reminder_count": 1,
  "deleted": true
}));
if (result.success) {
  print(result.data);
}

Response 200 application/json

{
  "id": 42,
  "name": "Beispiel",
  "global_default": true,
  "bill_reminder_count": 1,
  "template": {
    "id": "42",
    "name": "Beispiel",
    "predefined": true,
    "data_type": "string",
    "data_type_label": "string",
    "template_mode": "string",
    "last_check_status": "string",
    "tag": "string",
    "mass_message": true,
    "default_store_as_pdf": true
  },
  "predefined_billing_item": {
    "name": "Beispiel",
    "description": "Text",
    "id": 42,
    "internal_description": "Text",
    "fixed_hours": 1.5,
    "fixed_price": 49.9,
    "fixed_price_base_unit": 49.9,
    "price_fixed_hours": 49.9,
    "price_additional_hours": 49.9,
    "name_additional_hours": "string"
  },
  "deleted": true
}

Update a BillReminder

PATCH/api/invoice/bill_reminder/{identifier}

Path parameters

identifierrequiredstring

Request body application/json

dataBillReminder2
Show fields (5)
- idinteger
  Primary key of the bill reminder. Internal ID.
- namestring
  Name of the reminder level, for example first reminder.
- global_defaultboolean
  Default reminder for all companies.
- bill_reminder_countinteger
  Level of the reminder, starting at 1.
- deletedboolean
  This property is used to mark an entity as deleted / archived

Responses

200Update a BillReminderBillReminder

Show fields (7)

idinteger
Primary key of the bill reminder. Internal ID.
namestring
Name of the reminder level, for example first reminder.
global_defaultboolean
Default reminder for all companies.
bill_reminder_countinteger
Level of the reminder, starting at 1.
templateFlexibleLatexTemplate
Document template of the reminder.
Show fields (35)
- predefinedboolean
  True for templates shipped by the servercontrolpanel (PredefinedFlexibleTemplateMap). Their IDs are referenced by code, so the UI offers to duplicate ("Vorlage anpassen") instead of editing them.
- data_typestring
  Data type (reference class key) the template is rendered and checked with. For predefined templates (tag IW_PFLT) this is the data type of the code that uses them.
- data_type_labelstring
  Human readable name of the assigned data type, null for tags that are not a known data type.
- template_modestring
  Serialized mode so clients do not have to know that null means standard.
- last_check_statusstring
  Summary of the last template check for list views, the full result is admin detail only.
- idstring
  Primary key of the template. Internal ID. Used as a string identifier.
- namestring
  Name of the template.
- tagstring
  Tag used to group templates.
- mass_messageboolean
  Whether the template is used for mass messages.
- default_store_as_pdfboolean
  Whether the generated document is stored as PDF by default.
- security_scopestring
  Scope that controls who can use the template.
- security_user_access_typeinteger
  Access type required to use the template.
- param1string
  Value of parameter 1 used in the template.
- param2string
  Value of parameter 2 used in the template.
- param3string
  Value of parameter 3 used in the template.
- param4string
  Value of parameter 4 used in the template.
- param5string
  Value of parameter 5 used in the template.
- param6string
  Value of parameter 6 used in the template.
- param7string
  Value of parameter 7 used in the template.
- param8string
  Value of parameter 8 used in the template.
- param9string
  Value of parameter 9 used in the template.
- param10string
  Value of parameter 10 used in the template.
- default_value_param1string
  Default value of parameter 1.
- default_value_param2string
  Default value of parameter 2.
- default_value_param3string
  Default value of parameter 3.
- default_value_param4string
  Default value of parameter 4.
- default_value_param5string
  Default value of parameter 5.
- default_value_param6string
  Default value of parameter 6.
- default_value_param7string
  Default value of parameter 7.
- default_value_param8string
  Default value of parameter 8.
- default_value_param9string
  Default value of parameter 9.
- default_value_param10string
  Default value of parameter 10.
- deletedboolean
  This property is used to mark an entity as deleted / archived
- createdstring (date-time)
  Point in time the entity was created.
- updatedstring (date-time)
  Point in time the entity was last updated.
predefined_billing_itemPredefinedBillingItem11
Billing item charged with the reminder fee.
Show fields (81)
- idinteger
  Primary key of the mapped billing item. Internal ID.
- namestringrequired
  Name of the billing item.
- descriptionstringrequired
  Description of the billing item shown to the customer.
- internal_descriptionstring
  Internal description of the billing item, not shown to the customer.
- fixed_hoursnumber (float)
  Fixed number of hours billed.
- fixed_pricenumber (float)
  Fixed price billed.
- fixed_price_base_unitnumber (float)
  Base unit for the fixed price.
- price_fixed_hoursnumber (float)
  Price for the fixed hours.
- price_additional_hoursnumber (float)
  Price for each additional hour.
- name_additional_hoursstring
  Name of the additional hours item.
- description_additional_hoursstring
  Description of the additional hours item.
- time_billed_on_ticket_closeboolean
  Whether the time is billed when the ticket is closed.
- billing_typeBillingItemType
  Billing item type.
- buying_pricenumber (float)
  Purchase price of the item.
- recurrenceCRMRecurrence
  Recurrence the billing item follows.
- deletedboolean
  Whether the billing item is deleted.
- condition_date_afterstring (date-time)
  The item applies only to dates after this date.
- condition_date_beforestring (date-time)
  The item applies only to dates before this date.
- condition_country_codestring
  Country code the item applies to.
- condition_zip_code_fromstring
  Start of the postal code range the item applies to.
- condition_zip_code_tostring
  End of the postal code range the item applies to.
- condition_time_after_hourinteger
  The item applies only after this hour of the day.
- condition_max_lengthinteger
  Maximum length the item applies to.
- condition_time_before_hourinteger
  The item applies only before this hour of the day.
- condition_sub_access_tagAccessTag
  Access tag a subscription must have for the item to apply.
- condition_show_despite_missing_access_tagboolean
  Whether the item is shown even if the access tag is missing.
- condition_sub_free_logicstring
  Free-form condition logic for the subscription.
- fixed_price_logicstring
  Free-form logic that calculates the fixed price.
- sub_self_service_addboolean
  Whether members can add the subscription themselves.
- sub_self_service_deleteboolean
  Whether members can cancel the subscription themselves.
- sub_self_service_add_fixed_pricenumber (float)
  Fixed price charged when members add the subscription themselves.
- sub_self_service_delete_fixed_pricenumber (float)
  Fixed price charged when members cancel the subscription themselves.
- sub_pre_paidboolean
  Whether the subscription is paid in advance.
- sub_only_billed_after_startboolean
  Whether the subscription is only billed after its start date.
- sub_people_age_group_oneinteger
  Upper age limit of age group one.
- sub_people_age_group_one_discountinteger
  Discount in percent for age group one.
- sub_people_age_group_one_freeinteger
  Number of free places for age group one.
- sub_people_age_group_twointeger
  Upper age limit of age group two.
- sub_people_age_group_two_discountinteger
  Discount in percent for age group two.
- sub_people_age_group_two_freeinteger
  Number of free places for age group two.
- sub_people_age_group_threeinteger
  Upper age limit of age group three.
- sub_people_age_group_three_discountinteger
  Discount in percent for age group three.
- sub_people_age_group_three_freeinteger
  Number of free places for age group three.
- sub_people_age_group_fourinteger
  Upper age limit of age group four.
- sub_people_age_group_four_discountinteger
  Discount in percent for age group four.
- sub_people_age_group_four_freeinteger
  Number of free places for age group four.
- price_is_bruttoboolean
  Whether the prices are gross prices including tax.
- skustring
  Artikelnummer (Stock Keeping Unit)
- barcodestring
  Barcode (ISBN, UPC, GTIN usw.)
- companyCRMCompany
  Company the billing item belongs to.
- parentPredefinedBillingItem11
  Parent billing item, for example for variants.
- is_preferredboolean
  The item is preferred and shown first.
- is_defaultboolean
  The item is the default for its type.
- is_discountboolean
  The item is a discount.
- is_freeboolean
  The item is free of charge.
- is_passiveboolean
  The item is passive and cannot be selected anymore.
- is_globalboolean
  The item is available for all companies.
- inventory_countinteger
  Number of pieces in stock, if the item is a product.
- stock_itemboolean
  This is flag for items that can be ordered at any time
- producer_guarantee_yearsnumber (float)
  Herstellergarantie in Jahren (ganze Jahre oder ,5-Schritte, siehe ProductGuaranteeYears). Grundlage fuer das EU GARAN Label (nur bei Garantie > 2 Jahre zulaessig). Producer guarantee of durability in years (whole or .5 steps), basis for the EU GARAN label.
- producer_brandstring
  Hersteller / Marke, die die Haltbarkeitsgarantie gibt - editierbares Feld "Brand/Trademark" des EU GARAN Labels. Producer / brand offering the commercial guarantee of durability.
- energy_label_attachmentAttachment10
  Energielabel (EU Energieverbrauchskennzeichnung) als Bild/PDF fuer Shop, Warenkorb und Mail. EU energy label image/PDF of this product.
- garan_label_attachmentAttachment10
  Grosses EU GARAN Label (DVO 2025/1960): kostenlose Haltbarkeitsgarantie des Herstellers von mehr als zwei Jahren, mit Jahren, Marke und Modell. Full EU GARAN label (commercial guarantee of durability > 2 years).
- garan_label_pictogram_attachmentAttachment10
  "Nested label" / Piktogramm des EU GARAN Labels: zeigt nur die Jahre, beim Klick/Hover muss das grosse Label (garanLabelAttachment) erscheinen. EU GARAN "nested label" pictogram showing only the years; links to the full label online.
- public_categorystring
  Category of the item shown publicly.
- condition_booking_content_typeBookingContentType17
  Item applies only to bookings with this content type (e.g. flight type). Null = all content types.
- usage_time_baseinteger
  Section time pair used for usage billing: BaseBookingRealUsage::BILLING_TYPE_BLOCK_TIME or BILLING_TYPE_FLIGHT_TIME. Null = follow the usage record's billingType.
- base_locationBaseLocation10
  Location this charge belongs to (e.g. airport landing/takeoff fee), category CATEGORY_LOCATION
- condition_day_of_week_maskinteger
  Day-of-week bitmask (Mon=1 ... Sun=64, see DayOfWeekBitmaskHelper). Null = every day.
- condition_first_usage_onlyboolean
  Charge applies only once per usage record (first matching section, quantity 1)
- budget_grant_countinteger
  Number of event sign-ups this product grants when purchased (null = no budget)
- budget_create_onceboolean
  If true, budget is only created once per person+product combination. For recurring subscriptions: monthly payment but yearly budget.
- ticket_quotainteger
  Ticketverkauf (BaseEvent::isTicketSalesEnabled): Kontingent dieser Ticketart (Event-Preis). Null = nur das Teilnehmerlimit des Events zählt.
- ticket_sale_startstring (date-time)
  Ticketverkauf: Verkaufsstart dieser Ticketart (z. B. Frühbucher ab), null = sofort.
- ticket_sale_endstring (date-time)
  Ticketverkauf: Verkaufsende dieser Ticketart (z. B. Frühbucher bis), null = bis zum Anmeldeschluss.
- ticket_seat_zonestring
  Ticketverkauf mit Sitzplan: Diese Ticketart gilt nur für Plätze dieser Preiszone (BaseLocationPlanItem::seatZone), null = für jeden Platz.
- cancellation_term_unitstring
  Allowed cancellation terms for this subscription product. Null / empty = inherit the club default from settings. See CancellationTermCalculator::TERM_UNITS.
- cancellation_term_datesstring
  Comma separated list of fixed cancellation dates in DD.MM format, e.g. "31.03,30.06,30.09,31.12". Only used when cancellationTermUnit is CUSTOM.
- cancellation_notice_valueinteger
  Numeric value of the notice period before the cancellation term. Null = inherit from settings.
- cancellation_notice_unitstring
  Unit of the notice period: DAYS, WEEKS or MONTHS. Null = inherit from settings.
- … 6 more fields
deletedboolean
This property is used to mark an entity as deleted / archived

Request

curl --request PATCH \
  --url https://your-instance.iw-erp.de/api/invoice/bill_reminder/42 \
  --header 'content-type: application/json' \
  --header 'x-iw-jwt-token: <TOKEN>' \
  --data '
{
  "data": {
    "id": 42,
    "name": "Beispiel",
    "global_default": true,
    "bill_reminder_count": 1,
    "deleted": true
  }
}
'

const options = {
  method: 'PATCH',
  headers: {'x-iw-jwt-token': '<TOKEN>', 'content-type': 'application/json'},
  body: JSON.stringify({
    data: {
      id: 42,
      name: 'Beispiel',
      global_default: true,
      bill_reminder_count: 1,
      deleted: true
    }
  })
};

fetch('https://your-instance.iw-erp.de/api/invoice/bill_reminder/42', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://your-instance.iw-erp.de/api/invoice/bill_reminder/42"

payload = { "data": {
    "id": 42,
    "name": "Beispiel",
    "global_default": True,
    "bill_reminder_count": 1,
    "deleted": True
  } }
headers = {
  "x-iw-jwt-token": "<TOKEN>",
  "content-type": "application/json"
}

response = requests.patch(url, json=payload, headers=headers)

print(response.text)

<?php
require_once('vendor/autoload.php');

$client = new \GuzzleHttp\Client();

$response = $client->request('PATCH', 'https://your-instance.iw-erp.de/api/invoice/bill_reminder/42', [
  'body' => '{"data":{"id":42,"name":"Beispiel","global_default":true,"bill_reminder_count":1,"deleted":true}}',
  'headers' => [
    'content-type' => 'application/json',
    'x-iw-jwt-token' => '<TOKEN>',
  ],
]);

echo $response->getBody();

using System.Net.Http.Headers;
var client = new HttpClient();
var request = new HttpRequestMessage
{
  Method = HttpMethod.Patch,
  RequestUri = new Uri("https://your-instance.iw-erp.de/api/invoice/bill_reminder/42"),
  Headers =
  {
    { "x-iw-jwt-token", "<TOKEN>" },
  },
  Content = new StringContent("{\"data\":{\"id\":42,\"name\":\"Beispiel\",\"global_default\":true,\"bill_reminder_count\":1,\"deleted\":true}}")
  {
    Headers =
    {
      ContentType = new MediaTypeHeaderValue("application/json")
    }
  }
};
using (var response = await client.SendAsync(request))
{
  response.EnsureSuccessStatusCode();
  var body = await response.Content.ReadAsStringAsync();
  Console.WriteLine(body);
}

OkHttpClient client = new OkHttpClient();

MediaType mediaType = MediaType.parse("application/json");
RequestBody body = RequestBody.create(mediaType, "{\"data\":{\"id\":42,\"name\":\"Beispiel\",\"global_default\":true,\"bill_reminder_count\":1,\"deleted\":true}}");
Request request = new Request.Builder()
  .url("https://your-instance.iw-erp.de/api/invoice/bill_reminder/42")
  .patch(body)
  .addHeader("x-iw-jwt-token", "<TOKEN>")
  .addHeader("content-type", "application/json")
  .build();

Response response = client.newCall(request).execute();

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://your-instance.iw-erp.de/api/invoice/bill_reminder/42"

	payload := strings.NewReader("{\"data\":{\"id\":42,\"name\":\"Beispiel\",\"global_default\":true,\"bill_reminder_count\":1,\"deleted\":true}}")

	req, _ := http.NewRequest("PATCH", url, payload)

	req.Header.Add("x-iw-jwt-token", "<TOKEN>")
	req.Header.Add("content-type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

Dart with package:http (no controller in the iw_erp_api package)

import 'dart:convert';
import 'package:http/http.dart' as http;

final response = await http.patch(
  Uri.parse('https://your-instance.iw-erp.de/api/invoice/bill_reminder/42'),
  headers: {'x-iw-jwt-token': '<TOKEN>', 'content-type': 'application/json'},
  body: jsonEncode({
    "data": {
      "id": 42,
      "name": "Beispiel",
      "global_default": true,
      "bill_reminder_count": 1,
      "deleted": true
    }
  }),
);
print(response.body);

Response 200 application/json

{
  "id": 42,
  "name": "Beispiel",
  "global_default": true,
  "bill_reminder_count": 1,
  "template": {
    "id": "42",
    "name": "Beispiel",
    "predefined": true,
    "data_type": "string",
    "data_type_label": "string",
    "template_mode": "string",
    "last_check_status": "string",
    "tag": "string",
    "mass_message": true,
    "default_store_as_pdf": true
  },
  "predefined_billing_item": {
    "name": "Beispiel",
    "description": "Text",
    "id": 42,
    "internal_description": "Text",
    "fixed_hours": 1.5,
    "fixed_price": 49.9,
    "fixed_price_base_unit": 49.9,
    "price_fixed_hours": 49.9,
    "price_additional_hours": 49.9,
    "name_additional_hours": "string"
  },
  "deleted": true
}