curl -X GET \
 /customers/{customerId}/billing-groups \
 --header "Authorization: Bearer <token>"

import requests

url = "https://coreapi.io/customers/{customerId}/billing-groups"

headers = {"Authorization": "Bearer <token>"}

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

print(response.text)

const options = {method: 'GET', headers: {Authorization: 'Bearer <token>'}};

fetch('https://coreapi.io/customers/{customerId}/billing-groups', 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://coreapi.io/customers/{customerId}/billing-groups",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "GET",
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>"
  ],
]);

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

curl_close($curl);

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

{
  "data": [
    {
      "name": "Billing of payments at the end of the month",
      "type": "end_of_month",
      "id": "01F9ZQZJZJQZJZJZJZJZJZJZJZ",
      "customDay": 31,
      "customMonth": 12
    }
  ],
  "meta": {
    "pagination": {
      "totalItems": 123,
      "itemsPerPage": 123,
      "currentPage": 123,
      "lastPage": 123,
      "pageTotalItems": 123
    }
  }
}