curl --request POST \
  --url https://api.contracting.kukkingu.software/api/v1/invoices \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --header 'tenant-id: <tenant-id>' \
  --data '
{
  "contractId": "ctr_z23aoo8naxk68ewcr64tchh5",
  "invoiceNumber": "INV-2025-0001",
  "currencyCode": "EUR",
  "issuedAt": "2023-10-05T14:48:00.000Z",
  "dueAt": "2023-10-05T14:48:00.000Z",
  "paidAt": "2023-10-05T14:48:00.000Z"
}
'

import requests

url = "https://api.contracting.kukkingu.software/api/v1/invoices"

payload = {
    "contractId": "ctr_z23aoo8naxk68ewcr64tchh5",
    "invoiceNumber": "INV-2025-0001",
    "currencyCode": "EUR",
    "issuedAt": "2023-10-05T14:48:00.000Z",
    "dueAt": "2023-10-05T14:48:00.000Z",
    "paidAt": "2023-10-05T14:48:00.000Z"
}
headers = {
    "tenant-id": "<tenant-id>",
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {
    'tenant-id': '<tenant-id>',
    Authorization: 'Bearer <token>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    contractId: 'ctr_z23aoo8naxk68ewcr64tchh5',
    invoiceNumber: 'INV-2025-0001',
    currencyCode: 'EUR',
    issuedAt: '2023-10-05T14:48:00.000Z',
    dueAt: '2023-10-05T14:48:00.000Z',
    paidAt: '2023-10-05T14:48:00.000Z'
  })
};

fetch('https://api.contracting.kukkingu.software/api/v1/invoices', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.contracting.kukkingu.software/api/v1/invoices",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'contractId' => 'ctr_z23aoo8naxk68ewcr64tchh5',
    'invoiceNumber' => 'INV-2025-0001',
    'currencyCode' => 'EUR',
    'issuedAt' => '2023-10-05T14:48:00.000Z',
    'dueAt' => '2023-10-05T14:48:00.000Z',
    'paidAt' => '2023-10-05T14:48:00.000Z'
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json",
    "tenant-id: <tenant-id>"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

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

func main() {

	url := "https://api.contracting.kukkingu.software/api/v1/invoices"

	payload := strings.NewReader("{\n  \"contractId\": \"ctr_z23aoo8naxk68ewcr64tchh5\",\n  \"invoiceNumber\": \"INV-2025-0001\",\n  \"currencyCode\": \"EUR\",\n  \"issuedAt\": \"2023-10-05T14:48:00.000Z\",\n  \"dueAt\": \"2023-10-05T14:48:00.000Z\",\n  \"paidAt\": \"2023-10-05T14:48:00.000Z\"\n}")

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

	req.Header.Add("tenant-id", "<tenant-id>")
	req.Header.Add("Authorization", "Bearer <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))

}

HttpResponse<String> response = Unirest.post("https://api.contracting.kukkingu.software/api/v1/invoices")
  .header("tenant-id", "<tenant-id>")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"contractId\": \"ctr_z23aoo8naxk68ewcr64tchh5\",\n  \"invoiceNumber\": \"INV-2025-0001\",\n  \"currencyCode\": \"EUR\",\n  \"issuedAt\": \"2023-10-05T14:48:00.000Z\",\n  \"dueAt\": \"2023-10-05T14:48:00.000Z\",\n  \"paidAt\": \"2023-10-05T14:48:00.000Z\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.contracting.kukkingu.software/api/v1/invoices")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["tenant-id"] = '<tenant-id>'
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"contractId\": \"ctr_z23aoo8naxk68ewcr64tchh5\",\n  \"invoiceNumber\": \"INV-2025-0001\",\n  \"currencyCode\": \"EUR\",\n  \"issuedAt\": \"2023-10-05T14:48:00.000Z\",\n  \"dueAt\": \"2023-10-05T14:48:00.000Z\",\n  \"paidAt\": \"2023-10-05T14:48:00.000Z\"\n}"

response = http.request(request)
puts response.read_body

{
  "data": {
    "id": "inv_mqxd1kc6bgtcc676xoqzax47",
    "contract": "ctr_z23aoo8naxk68ewcr64tchh5",
    "status": "FINALIZED",
    "invoiceNumber": "INV-2025-0001",
    "currencyCode": "EUR",
    "subtotalMinor": 5000,
    "totalMinor": 5000,
    "billableCount": 4503599627370495,
    "createdAt": "2023-10-05T14:48:00.000Z",
    "updatedAt": "2023-10-05T14:48:00.000Z",
    "issuedAt": "2023-10-05T14:48:00.000Z",
    "dueAt": "2023-10-05T14:48:00.000Z",
    "paidAt": "2023-10-05T14:48:00.000Z"
  }
}

{
  "error": "ValidationError",
  "message": "<string>",
  "details": [
    {
      "field": "<string>",
      "message": "<string>",
      "constraint": "<string>"
    }
  ]
}

{
  "error": "Unauthorized",
  "message": "Unauthorized"
}

{
  "error": "Forbidden",
  "message": "Forbidden"
}

{
  "error": "NotFound",
  "message": "Not Found"
}