DonationExternal

Abrechnung9 EndpunkteBilling / DonationExternal

Verfügbare Spendenbeträge und Funktionsstatus abrufen

GET/api/invoice/external/donation/amounts

Antworten

200Liefert die verfügbaren Spendenbeträge.

Anfrage

curl --request GET \
  --url https://eure-instanz.iw-erp.de/api/invoice/external/donation/amounts \
  --header 'x-iw-jwt-token: <TOKEN>'

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

fetch('https://eure-instanz.iw-erp.de/api/invoice/external/donation/amounts', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://eure-instanz.iw-erp.de/api/invoice/external/donation/amounts"

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://eure-instanz.iw-erp.de/api/invoice/external/donation/amounts', [
  '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://eure-instanz.iw-erp.de/api/invoice/external/donation/amounts"),
  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://eure-instanz.iw-erp.de/api/invoice/external/donation/amounts")
  .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://eure-instanz.iw-erp.de/api/invoice/external/donation/amounts"

	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 mit dem Package iw_erp_api

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

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

final result = await BillingDonationExternalController.getAvailableAmounts();
if (result.success) {
  print(result.data);
}

Eine Spende mit Zahlung einleiten

POST/api/invoice/external/donation/initiate

Antworten

200Erstellt eine Spende und liefert die Weiterleitungs-URL zur Zahlung zurück

Anfrage

curl --request POST \
  --url https://eure-instanz.iw-erp.de/api/invoice/external/donation/initiate \
  --header 'x-iw-jwt-token: <TOKEN>'

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

fetch('https://eure-instanz.iw-erp.de/api/invoice/external/donation/initiate', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://eure-instanz.iw-erp.de/api/invoice/external/donation/initiate"

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

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

print(response.text)

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

$client = new \GuzzleHttp\Client();

$response = $client->request('POST', 'https://eure-instanz.iw-erp.de/api/invoice/external/donation/initiate', [
  'headers' => [
    '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://eure-instanz.iw-erp.de/api/invoice/external/donation/initiate"),
  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://eure-instanz.iw-erp.de/api/invoice/external/donation/initiate")
  .post(null)
  .addHeader("x-iw-jwt-token", "<TOKEN>")
  .build();

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

package main

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

func main() {

	url := "https://eure-instanz.iw-erp.de/api/invoice/external/donation/initiate"

	req, _ := http.NewRequest("POST", 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 mit dem Package iw_erp_api

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

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

final result = await BillingDonationExternalController.initiateDonation(amount: 42, donorName: '…', donorEmail: '…');
if (result.success) {
  print(result.data);
}

Rückruf-Benachrichtigung des Zahlungsanbieters

GET/api/invoice/external/donation/notify/{token}/{paymentProvider}

Pfad-Parameter

`token`Pflichtstring
`paymentProvider`Pflichtstring

Antworten

200Verarbeitet Zahlungsbenachrichtigung

Anfrage

curl --request GET \
  --url https://eure-instanz.iw-erp.de/api/invoice/external/donation/notify/42/42 \
  --header 'x-iw-jwt-token: <TOKEN>'

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

fetch('https://eure-instanz.iw-erp.de/api/invoice/external/donation/notify/42/42', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://eure-instanz.iw-erp.de/api/invoice/external/donation/notify/42/42"

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://eure-instanz.iw-erp.de/api/invoice/external/donation/notify/42/42', [
  '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://eure-instanz.iw-erp.de/api/invoice/external/donation/notify/42/42"),
  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://eure-instanz.iw-erp.de/api/invoice/external/donation/notify/42/42")
  .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://eure-instanz.iw-erp.de/api/invoice/external/donation/notify/42/42"

	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 mit package:http (kein Controller im Package iw_erp_api)

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

final response = await http.get(
  Uri.parse('https://eure-instanz.iw-erp.de/api/invoice/external/donation/notify/42/42'),
  headers: {'x-iw-jwt-token': '<TOKEN>'},
);
print(response.body);

Rückruf-Benachrichtigung des Zahlungsanbieters

POST/api/invoice/external/donation/notify/{token}/{paymentProvider}

Pfad-Parameter

`token`Pflichtstring
`paymentProvider`Pflichtstring

Antworten

200Verarbeitet Zahlungsbenachrichtigung

Anfrage

curl --request POST \
  --url https://eure-instanz.iw-erp.de/api/invoice/external/donation/notify/42/42 \
  --header 'x-iw-jwt-token: <TOKEN>'

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

fetch('https://eure-instanz.iw-erp.de/api/invoice/external/donation/notify/42/42', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://eure-instanz.iw-erp.de/api/invoice/external/donation/notify/42/42"

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

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

print(response.text)

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

$client = new \GuzzleHttp\Client();

$response = $client->request('POST', 'https://eure-instanz.iw-erp.de/api/invoice/external/donation/notify/42/42', [
  'headers' => [
    'x-iw-jwt-token' => '<TOKEN>',
  ],
]);

echo $response->getBody();

using System.Net.Http.Headers;
var client = new HttpClient();
var request = new HttpRequestMessage
{
  Method = HttpMethod.Post,
  RequestUri = new Uri("https://eure-instanz.iw-erp.de/api/invoice/external/donation/notify/42/42"),
  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://eure-instanz.iw-erp.de/api/invoice/external/donation/notify/42/42")
  .post(null)
  .addHeader("x-iw-jwt-token", "<TOKEN>")
  .build();

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

package main

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

func main() {

	url := "https://eure-instanz.iw-erp.de/api/invoice/external/donation/notify/42/42"

	req, _ := http.NewRequest("POST", 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 mit package:http (kein Controller im Package iw_erp_api)

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

final response = await http.post(
  Uri.parse('https://eure-instanz.iw-erp.de/api/invoice/external/donation/notify/42/42'),
  headers: {'x-iw-jwt-token': '<TOKEN>'},
);
print(response.body);

Spendenbescheinigung als PDF per Token herunterladen

GET/api/invoice/external/donation/pdf/{id}/{token}

Pfad-Parameter

`id`Pflichtstring
`token`Pflichtstring

Antworten

200Liefert die Spendenbescheinigung als PDF

Anfrage

curl --request GET \
  --url https://eure-instanz.iw-erp.de/api/invoice/external/donation/pdf/42/42 \
  --header 'x-iw-jwt-token: <TOKEN>'

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

fetch('https://eure-instanz.iw-erp.de/api/invoice/external/donation/pdf/42/42', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://eure-instanz.iw-erp.de/api/invoice/external/donation/pdf/42/42"

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://eure-instanz.iw-erp.de/api/invoice/external/donation/pdf/42/42', [
  '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://eure-instanz.iw-erp.de/api/invoice/external/donation/pdf/42/42"),
  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://eure-instanz.iw-erp.de/api/invoice/external/donation/pdf/42/42")
  .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://eure-instanz.iw-erp.de/api/invoice/external/donation/pdf/42/42"

	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 mit dem Package iw_erp_api

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

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

final result = await BillingDonationExternalController.getDownloadLinkPdf('42', '42');
print(result);

Eine wiederkehrende Spende einleiten, die per SEPA-Lastschrift eingezogen wird.

POST/api/invoice/external/donation/recurring/initiate

Antworten

200Erstellt eine wiederkehrende Spende mit SEPA-Mandat

Anfrage

curl --request POST \
  --url https://eure-instanz.iw-erp.de/api/invoice/external/donation/recurring/initiate \
  --header 'x-iw-jwt-token: <TOKEN>'

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

fetch('https://eure-instanz.iw-erp.de/api/invoice/external/donation/recurring/initiate', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://eure-instanz.iw-erp.de/api/invoice/external/donation/recurring/initiate"

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

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

print(response.text)

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

$client = new \GuzzleHttp\Client();

$response = $client->request('POST', 'https://eure-instanz.iw-erp.de/api/invoice/external/donation/recurring/initiate', [
  'headers' => [
    '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://eure-instanz.iw-erp.de/api/invoice/external/donation/recurring/initiate"),
  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://eure-instanz.iw-erp.de/api/invoice/external/donation/recurring/initiate")
  .post(null)
  .addHeader("x-iw-jwt-token", "<TOKEN>")
  .build();

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

package main

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

func main() {

	url := "https://eure-instanz.iw-erp.de/api/invoice/external/donation/recurring/initiate"

	req, _ := http.NewRequest("POST", 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 mit dem Package iw_erp_api

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

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

final result = await BillingDonationExternalController.initiateRecurringDonation(amount: 42, interval: '…', donorName: '…', donorEmail: '…', accountHolder: '…', iban: '…', mandateConsent: true);
if (result.success) {
  print(result.data);
}

Dauerspenden-Status per Token abrufen

GET/api/invoice/external/donation/recurring/{token}

Pfad-Parameter

tokenPflichtstring

Antworten

200Liefert den Status der Dauerspende

Anfrage

curl --request GET \
  --url https://eure-instanz.iw-erp.de/api/invoice/external/donation/recurring/42 \
  --header 'x-iw-jwt-token: <TOKEN>'

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

fetch('https://eure-instanz.iw-erp.de/api/invoice/external/donation/recurring/42', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://eure-instanz.iw-erp.de/api/invoice/external/donation/recurring/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://eure-instanz.iw-erp.de/api/invoice/external/donation/recurring/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://eure-instanz.iw-erp.de/api/invoice/external/donation/recurring/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://eure-instanz.iw-erp.de/api/invoice/external/donation/recurring/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://eure-instanz.iw-erp.de/api/invoice/external/donation/recurring/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 mit dem Package iw_erp_api

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

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

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

Eine wiederkehrende Spende per Token stornieren

POST/api/invoice/external/donation/recurring/{token}/cancel

Pfad-Parameter

tokenPflichtstring

Antworten

200Storniert eine wiederkehrende Spende

Anfrage

curl --request POST \
  --url https://eure-instanz.iw-erp.de/api/invoice/external/donation/recurring/42/cancel \
  --header 'x-iw-jwt-token: <TOKEN>'

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

fetch('https://eure-instanz.iw-erp.de/api/invoice/external/donation/recurring/42/cancel', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://eure-instanz.iw-erp.de/api/invoice/external/donation/recurring/42/cancel"

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

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

print(response.text)

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

$client = new \GuzzleHttp\Client();

$response = $client->request('POST', 'https://eure-instanz.iw-erp.de/api/invoice/external/donation/recurring/42/cancel', [
  'headers' => [
    '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://eure-instanz.iw-erp.de/api/invoice/external/donation/recurring/42/cancel"),
  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://eure-instanz.iw-erp.de/api/invoice/external/donation/recurring/42/cancel")
  .post(null)
  .addHeader("x-iw-jwt-token", "<TOKEN>")
  .build();

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

package main

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

func main() {

	url := "https://eure-instanz.iw-erp.de/api/invoice/external/donation/recurring/42/cancel"

	req, _ := http.NewRequest("POST", 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 mit dem Package iw_erp_api

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

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

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

Spendenstatus per Token abrufen

GET/api/invoice/external/donation/{token}

Pfad-Parameter

tokenPflichtstring

Antworten

200Liefert den Spendenstatus

Anfrage

curl --request GET \
  --url https://eure-instanz.iw-erp.de/api/invoice/external/donation/42 \
  --header 'x-iw-jwt-token: <TOKEN>'

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

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

import requests

url = "https://eure-instanz.iw-erp.de/api/invoice/external/donation/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://eure-instanz.iw-erp.de/api/invoice/external/donation/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://eure-instanz.iw-erp.de/api/invoice/external/donation/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://eure-instanz.iw-erp.de/api/invoice/external/donation/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://eure-instanz.iw-erp.de/api/invoice/external/donation/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 mit dem Package iw_erp_api

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

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

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