curl --request POST \
  --url https://api.zenskar.com/invoices/generate_invoice \
  --header 'Content-Type: application/json' \
  --header 'organisation: <api-key>' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "customer_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "contract_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "from_date": "2023-11-07T05:31:56Z",
  "to_date": "2023-11-07T05:31:56Z",
  "check_duplicate_invoice": true,
  "bill_for_date": "2023-11-07T05:31:56Z",
  "billing_cycle_start_day": 123
}
'

import requests

url = "https://api.zenskar.com/invoices/generate_invoice"

payload = {
    "customer_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "contract_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "from_date": "2023-11-07T05:31:56Z",
    "to_date": "2023-11-07T05:31:56Z",
    "check_duplicate_invoice": True,
    "bill_for_date": "2023-11-07T05:31:56Z",
    "billing_cycle_start_day": 123
}
headers = {
    "x-api-key": "<api-key>",
    "organisation": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {
    'x-api-key': '<api-key>',
    organisation: '<api-key>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    customer_id: '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    contract_id: '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    from_date: '2023-11-07T05:31:56Z',
    to_date: '2023-11-07T05:31:56Z',
    check_duplicate_invoice: true,
    bill_for_date: '2023-11-07T05:31:56Z',
    billing_cycle_start_day: 123
  })
};

fetch('https://api.zenskar.com/invoices/generate_invoice', 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.zenskar.com/invoices/generate_invoice",
  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([
    'customer_id' => '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    'contract_id' => '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    'from_date' => '2023-11-07T05:31:56Z',
    'to_date' => '2023-11-07T05:31:56Z',
    'check_duplicate_invoice' => true,
    'bill_for_date' => '2023-11-07T05:31:56Z',
    'billing_cycle_start_day' => 123
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "organisation: <api-key>",
    "x-api-key: <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.zenskar.com/invoices/generate_invoice"

	payload := strings.NewReader("{\n  \"customer_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"contract_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"from_date\": \"2023-11-07T05:31:56Z\",\n  \"to_date\": \"2023-11-07T05:31:56Z\",\n  \"check_duplicate_invoice\": true,\n  \"bill_for_date\": \"2023-11-07T05:31:56Z\",\n  \"billing_cycle_start_day\": 123\n}")

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

	req.Header.Add("x-api-key", "<api-key>")
	req.Header.Add("organisation", "<api-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.zenskar.com/invoices/generate_invoice")
  .header("x-api-key", "<api-key>")
  .header("organisation", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"customer_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"contract_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"from_date\": \"2023-11-07T05:31:56Z\",\n  \"to_date\": \"2023-11-07T05:31:56Z\",\n  \"check_duplicate_invoice\": true,\n  \"bill_for_date\": \"2023-11-07T05:31:56Z\",\n  \"billing_cycle_start_day\": 123\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.zenskar.com/invoices/generate_invoice")

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

request = Net::HTTP::Post.new(url)
request["x-api-key"] = '<api-key>'
request["organisation"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"customer_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"contract_id\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"from_date\": \"2023-11-07T05:31:56Z\",\n  \"to_date\": \"2023-11-07T05:31:56Z\",\n  \"check_duplicate_invoice\": true,\n  \"bill_for_date\": \"2023-11-07T05:31:56Z\",\n  \"billing_cycle_start_day\": 123\n}"

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

{
  "detail": [
    {
      "loc": [
        "<string>"
      ],
      "msg": "<string>",
      "type": "<string>"
    }
  ]
}