curl --request POST \
  --url https://api.maesn.dev/accounting/projects \
  --header 'Content-Type: application/json' \
  --header 'X-ACCOUNT-KEY: <x-account-key>' \
  --header 'X-API-KEY: <x-api-key>' \
  --data '
{
  "code": "9012",
  "contactId": "eaa28f49-6028-4b6e-bb12-d8f6278073fc",
  "currency": "EUR",
  "description": "Service and Maintenance Project",
  "endDate": "2021-01-01T00:00:00Z",
  "name": "Service und Unterhalt",
  "parentProjectId": "e587bs49-5be6-ee11-a201-6045bde98d28",
  "status": "ACTIVE",
  "startDate": "2021-01-01T00:00:00Z"
}
'

import requests

url = "https://api.maesn.dev/accounting/projects"

payload = {
    "code": "9012",
    "contactId": "eaa28f49-6028-4b6e-bb12-d8f6278073fc",
    "currency": "EUR",
    "description": "Service and Maintenance Project",
    "endDate": "2021-01-01T00:00:00Z",
    "name": "Service und Unterhalt",
    "parentProjectId": "e587bs49-5be6-ee11-a201-6045bde98d28",
    "status": "ACTIVE",
    "startDate": "2021-01-01T00:00:00Z"
}
headers = {
    "X-API-KEY": "<x-api-key>",
    "X-ACCOUNT-KEY": "<x-account-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {
    'X-API-KEY': '<x-api-key>',
    'X-ACCOUNT-KEY': '<x-account-key>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    code: '9012',
    contactId: 'eaa28f49-6028-4b6e-bb12-d8f6278073fc',
    currency: 'EUR',
    description: 'Service and Maintenance Project',
    endDate: '2021-01-01T00:00:00Z',
    name: 'Service und Unterhalt',
    parentProjectId: 'e587bs49-5be6-ee11-a201-6045bde98d28',
    status: 'ACTIVE',
    startDate: '2021-01-01T00:00:00Z'
  })
};

fetch('https://api.maesn.dev/accounting/projects', 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.maesn.dev/accounting/projects",
  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([
    'code' => '9012',
    'contactId' => 'eaa28f49-6028-4b6e-bb12-d8f6278073fc',
    'currency' => 'EUR',
    'description' => 'Service and Maintenance Project',
    'endDate' => '2021-01-01T00:00:00Z',
    'name' => 'Service und Unterhalt',
    'parentProjectId' => 'e587bs49-5be6-ee11-a201-6045bde98d28',
    'status' => 'ACTIVE',
    'startDate' => '2021-01-01T00:00:00Z'
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "X-ACCOUNT-KEY: <x-account-key>",
    "X-API-KEY: <x-api-key>"
  ],
]);

$response = curl_exec($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.maesn.dev/accounting/projects"

	payload := strings.NewReader("{\n  \"code\": \"9012\",\n  \"contactId\": \"eaa28f49-6028-4b6e-bb12-d8f6278073fc\",\n  \"currency\": \"EUR\",\n  \"description\": \"Service and Maintenance Project\",\n  \"endDate\": \"2021-01-01T00:00:00Z\",\n  \"name\": \"Service und Unterhalt\",\n  \"parentProjectId\": \"e587bs49-5be6-ee11-a201-6045bde98d28\",\n  \"status\": \"ACTIVE\",\n  \"startDate\": \"2021-01-01T00:00:00Z\"\n}")

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

	req.Header.Add("X-API-KEY", "<x-api-key>")
	req.Header.Add("X-ACCOUNT-KEY", "<x-account-key>")
	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.maesn.dev/accounting/projects")
  .header("X-API-KEY", "<x-api-key>")
  .header("X-ACCOUNT-KEY", "<x-account-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"code\": \"9012\",\n  \"contactId\": \"eaa28f49-6028-4b6e-bb12-d8f6278073fc\",\n  \"currency\": \"EUR\",\n  \"description\": \"Service and Maintenance Project\",\n  \"endDate\": \"2021-01-01T00:00:00Z\",\n  \"name\": \"Service und Unterhalt\",\n  \"parentProjectId\": \"e587bs49-5be6-ee11-a201-6045bde98d28\",\n  \"status\": \"ACTIVE\",\n  \"startDate\": \"2021-01-01T00:00:00Z\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.maesn.dev/accounting/projects")

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

request = Net::HTTP::Post.new(url)
request["X-API-KEY"] = '<x-api-key>'
request["X-ACCOUNT-KEY"] = '<x-account-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"code\": \"9012\",\n  \"contactId\": \"eaa28f49-6028-4b6e-bb12-d8f6278073fc\",\n  \"currency\": \"EUR\",\n  \"description\": \"Service and Maintenance Project\",\n  \"endDate\": \"2021-01-01T00:00:00Z\",\n  \"name\": \"Service und Unterhalt\",\n  \"parentProjectId\": \"e587bs49-5be6-ee11-a201-6045bde98d28\",\n  \"status\": \"ACTIVE\",\n  \"startDate\": \"2021-01-01T00:00:00Z\"\n}"

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

{
  "meta": {
    "warnings": [
      "Field not used by target system"
    ],
    "pagination": {
      "total": 125,
      "perPage": 50,
      "currentPage": 1,
      "totalPages": 3
    },
    "partialErrors": [
      {
        "code": "FILE_UPLOAD_FAILED",
        "message": "Attachment invoice.pdf could not be uploaded to the target system."
      }
    ]
  },
  "data": {
    "id": "c1f85763-5be6-ee11-a201-6045bde98d28",
    "code": "9012",
    "createdDate": "2021-01-01T00:00:00Z",
    "contactId": "eaa28f49-6028-4b6e-bb12-d8f6278073fc",
    "currency": "EUR",
    "description": "Service and Maintenance Project",
    "endDate": "2021-01-01T00:00:00Z",
    "name": "Service und Unterhalt",
    "parentProjectId": "e587bs49-5be6-ee11-a201-6045bde98d28",
    "status": "ACTIVE",
    "startDate": "2021-01-01T00:00:00Z",
    "updatedDate": "2021-01-01T00:00:00Z"
  }
}