Kassenbuch

curl --request GET \
  --url https://your-instance.iw-erp.de/api/invoice/cash_transaction \
  --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/cash_transaction', 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/cash_transaction"

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/cash_transaction', [
  '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/cash_transaction"),
  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/cash_transaction")
  .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/cash_transaction"

	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 package:http (no controller in the iw_erp_api package)

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

final response = await http.get(
  Uri.parse('https://your-instance.iw-erp.de/api/invoice/cash_transaction'),
  headers: {'x-iw-jwt-token': '<TOKEN>'},
);
print(response.body);

curl --request POST \
  --url https://your-instance.iw-erp.de/api/invoice/cash_transaction \
  --header 'content-type: application/json' \
  --header 'x-iw-jwt-token: <TOKEN>' \
  --data '
{
  "name": "Büromaterial",
  "transaction_date": "2026-07-31",
  "type": "expense",
  "gross_amount": 23.8,
  "tax_rate": 19,
  "tax_amount": 3.8
}
'

const options = {
  method: 'POST',
  headers: {'x-iw-jwt-token': '<TOKEN>', 'content-type': 'application/json'},
  body: JSON.stringify({
    name: 'Büromaterial',
    transaction_date: '2026-07-31',
    type: 'expense',
    gross_amount: 23.8,
    tax_rate: 19,
    tax_amount: 3.8
  })
};

fetch('https://your-instance.iw-erp.de/api/invoice/cash_transaction', 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/cash_transaction"

payload = {
  "name": "Büromaterial",
  "transaction_date": "2026-07-31",
  "type": "expense",
  "gross_amount": 23.8,
  "tax_rate": 19,
  "tax_amount": 3.8
}
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/cash_transaction', [
  'body' => '{"name":"Büromaterial","transaction_date":"2026-07-31","type":"expense","gross_amount":23.8,"tax_rate":19,"tax_amount":3.8}',
  '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/cash_transaction"),
  Headers =
  {
    { "x-iw-jwt-token", "<TOKEN>" },
  },
  Content = new StringContent("{\"name\":\"Büromaterial\",\"transaction_date\":\"2026-07-31\",\"type\":\"expense\",\"gross_amount\":23.8,\"tax_rate\":19,\"tax_amount\":3.8}")
  {
    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, "{\"name\":\"Büromaterial\",\"transaction_date\":\"2026-07-31\",\"type\":\"expense\",\"gross_amount\":23.8,\"tax_rate\":19,\"tax_amount\":3.8}");
Request request = new Request.Builder()
  .url("https://your-instance.iw-erp.de/api/invoice/cash_transaction")
  .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/cash_transaction"

	payload := strings.NewReader("{\"name\":\"Büromaterial\",\"transaction_date\":\"2026-07-31\",\"type\":\"expense\",\"gross_amount\":23.8,\"tax_rate\":19,\"tax_amount\":3.8}")

	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/cash_book_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 CashBookController.book(transactionDate: DateTime.fromJson({
  "name": "Büromaterial",
  "transaction_date": "2026-07-31",
  "type": "expense",
  "gross_amount": 23.8,
  "tax_rate": 19,
  "tax_amount": 3.8
}), type: '…', grossAmount: 42, name: '…');
if (result.success) {
  print(result.data);
}

curl --request GET \
  --url https://your-instance.iw-erp.de/api/invoice/cash_transaction/book \
  --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/cash_transaction/book', 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/cash_transaction/book"

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/cash_transaction/book', [
  '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/cash_transaction/book"),
  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/cash_transaction/book")
  .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/cash_transaction/book"

	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/cash_book_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 CashBookController.getBook();
if (result.success) {
  print(result.data);
}

curl --request GET \
  --url https://your-instance.iw-erp.de/api/invoice/cash_transaction/balance \
  --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/cash_transaction/balance', 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/cash_transaction/balance"

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/cash_transaction/balance', [
  '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/cash_transaction/balance"),
  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/cash_transaction/balance")
  .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/cash_transaction/balance"

	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/cash_book_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 CashBookController.getBalance();
if (result.success) {
  print(result.data);
}

curl --request POST \
  --url https://your-instance.iw-erp.de/api/invoice/cash_transaction/lock \
  --header 'content-type: application/json' \
  --header 'x-iw-jwt-token: <TOKEN>' \
  --data '
{
  "from": "2026-10-15",
  "to": "2026-10-15"
}
'

const options = {
  method: 'POST',
  headers: {'x-iw-jwt-token': '<TOKEN>', 'content-type': 'application/json'},
  body: JSON.stringify({from: '2026-10-15', to: '2026-10-15'})
};

fetch('https://your-instance.iw-erp.de/api/invoice/cash_transaction/lock', 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/cash_transaction/lock"

payload = {
  "from": "2026-10-15",
  "to": "2026-10-15"
}
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/cash_transaction/lock', [
  'body' => '{"from":"2026-10-15","to":"2026-10-15"}',
  '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/cash_transaction/lock"),
  Headers =
  {
    { "x-iw-jwt-token", "<TOKEN>" },
  },
  Content = new StringContent("{\"from\":\"2026-10-15\",\"to\":\"2026-10-15\"}")
  {
    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, "{\"from\":\"2026-10-15\",\"to\":\"2026-10-15\"}");
Request request = new Request.Builder()
  .url("https://your-instance.iw-erp.de/api/invoice/cash_transaction/lock")
  .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/cash_transaction/lock"

	payload := strings.NewReader("{\"from\":\"2026-10-15\",\"to\":\"2026-10-15\"}")

	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/cash_book_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 CashBookController.lock(from: DateTime.fromJson({
  "from": "2026-10-15",
  "to": "2026-10-15"
}), to: DateTime.fromJson({
  "from": "2026-10-15",
  "to": "2026-10-15"
}));
if (result.success) {
  print(result.data);
}

curl --request POST \
  --url https://your-instance.iw-erp.de/api/invoice/cash_transaction/42/reversal \
  --header 'content-type: application/json' \
  --header 'x-iw-jwt-token: <TOKEN>' \
  --data '
{
  "reason": "Betrag falsch erfasst"
}
'

const options = {
  method: 'POST',
  headers: {'x-iw-jwt-token': '<TOKEN>', 'content-type': 'application/json'},
  body: JSON.stringify({reason: 'Betrag falsch erfasst'})
};

fetch('https://your-instance.iw-erp.de/api/invoice/cash_transaction/42/reversal', 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/cash_transaction/42/reversal"

payload = { "reason": "Betrag falsch erfasst" }
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/cash_transaction/42/reversal', [
  'body' => '{"reason":"Betrag falsch erfasst"}',
  '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/cash_transaction/42/reversal"),
  Headers =
  {
    { "x-iw-jwt-token", "<TOKEN>" },
  },
  Content = new StringContent("{\"reason\":\"Betrag falsch erfasst\"}")
  {
    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, "{\"reason\":\"Betrag falsch erfasst\"}");
Request request = new Request.Builder()
  .url("https://your-instance.iw-erp.de/api/invoice/cash_transaction/42/reversal")
  .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/cash_transaction/42/reversal"

	payload := strings.NewReader("{\"reason\":\"Betrag falsch erfasst\"}")

	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/cash_book_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 CashBookController.reverse('42');
if (result.success) {
  print(result.data);
}