curl --request GET \
  --url http://127.0.0.1:8080/v1/c/entitlement/{customer_id}/billing \
  --header 'wb-key: <api-key>'

import requests

url = "http://127.0.0.1:8080/v1/c/entitlement/{customer_id}/billing"

headers = {"wb-key": "<api-key>"}

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

print(response.text)

const options = {method: 'GET', headers: {'wb-key': '<api-key>'}};

fetch('http://127.0.0.1:8080/v1/c/entitlement/{customer_id}/billing', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_PORT => "8080",
  CURLOPT_URL => "http://127.0.0.1:8080/v1/c/entitlement/{customer_id}/billing",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "GET",
  CURLOPT_HTTPHEADER => [
    "wb-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"
	"net/http"
	"io"
)

func main() {

	url := "http://127.0.0.1:8080/v1/c/entitlement/{customer_id}/billing"

	req, _ := http.NewRequest("GET", url, nil)

	req.Header.Add("wb-key", "<api-key>")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.get("http://127.0.0.1:8080/v1/c/entitlement/{customer_id}/billing")
  .header("wb-key", "<api-key>")
  .asString();

require 'uri'
require 'net/http'

url = URI("http://127.0.0.1:8080/v1/c/entitlement/{customer_id}/billing")

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

request = Net::HTTP::Get.new(url)
request["wb-key"] = '<api-key>'

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

{
  "contract": {
    "contract_id": "Cust_c40bea18-c0c9-44b1-bd0c-43f5283e1670"
  },
  "customer": {},
  "payment": {
    "payment_provider": "stripe",
    "unpaid_invoices_info": [
      {
        "payment_threshold": "<string>",
        "total_unpaid": "<string>",
        "unpaid_invoices": [
          {
            "amount": "<string>",
            "due_date": "2023-11-07T05:31:56Z",
            "id": "Cust_c40bea18-c0c9-44b1-bd0c-43f5283e1670"
          }
        ]
      }
    ],
    "wallet_balance": "<string>",
    "wallet_balances": [
      {
        "balance": "<string>",
        "customer_id": "Cust_c40bea18-c0c9-44b1-bd0c-43f5283e1670",
        "id": "Cust_c40bea18-c0c9-44b1-bd0c-43f5283e1670",
        "wb_customer_id": "Cust_c40bea18-c0c9-44b1-bd0c-43f5283e1670"
      }
    ],
    "next_payment_due": "2023-11-07T05:31:56Z"
  }
}