curl --request PATCH \
  --url https://api-eu.flexportal.io/v1/billing-groups/{billingGroupId} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --header 'Tenant-ID: <tenant-id>' \
  --data '
{
  "groupName": "<string>",
  "billingDay": 14,
  "rentalIds": [
    "<string>"
  ],
  "notes": "<string>"
}
'

import requests

url = "https://api-eu.flexportal.io/v1/billing-groups/{billingGroupId}"

payload = {
    "groupName": "<string>",
    "billingDay": 14,
    "rentalIds": ["<string>"],
    "notes": "<string>"
}
headers = {
    "Tenant-ID": "<tenant-id>",
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'PATCH',
  headers: {
    'Tenant-ID': '<tenant-id>',
    Authorization: 'Bearer <token>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    groupName: '<string>',
    billingDay: 14,
    rentalIds: ['<string>'],
    notes: '<string>'
  })
};

fetch('https://api-eu.flexportal.io/v1/billing-groups/{billingGroupId}', 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-eu.flexportal.io/v1/billing-groups/{billingGroupId}",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "PATCH",
  CURLOPT_POSTFIELDS => json_encode([
    'groupName' => '<string>',
    'billingDay' => 14,
    'rentalIds' => [
        '<string>'
    ],
    'notes' => '<string>'
  ]),
  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-eu.flexportal.io/v1/billing-groups/{billingGroupId}"

	payload := strings.NewReader("{\n  \"groupName\": \"<string>\",\n  \"billingDay\": 14,\n  \"rentalIds\": [\n    \"<string>\"\n  ],\n  \"notes\": \"<string>\"\n}")

	req, _ := http.NewRequest("PATCH", 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.patch("https://api-eu.flexportal.io/v1/billing-groups/{billingGroupId}")
  .header("Tenant-ID", "<tenant-id>")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"groupName\": \"<string>\",\n  \"billingDay\": 14,\n  \"rentalIds\": [\n    \"<string>\"\n  ],\n  \"notes\": \"<string>\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api-eu.flexportal.io/v1/billing-groups/{billingGroupId}")

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

request = Net::HTTP::Patch.new(url)
request["Tenant-ID"] = '<tenant-id>'
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"groupName\": \"<string>\",\n  \"billingDay\": 14,\n  \"rentalIds\": [\n    \"<string>\"\n  ],\n  \"notes\": \"<string>\"\n}"

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

{
  "success": true,
  "message": "<string>",
  "billingGroup": {
    "billingGroupId": "<string>",
    "tenantId": "<string>",
    "customerId": "<string>",
    "groupName": "<string>",
    "billingDay": 14,
    "totalMonthlyAmount": 1,
    "currency": "<string>",
    "status": "active",
    "createdBy": "<string>",
    "createdAt": "<string>",
    "updatedAt": "<string>",
    "rentalIds": [],
    "activeRentalCount": 0,
    "notes": "<string>"
  }
}

{
  "error": {
    "code": "<string>",
    "message": "<string>"
  }
}

{
  "error": {
    "code": "<string>",
    "message": "<string>"
  }
}