// Using axios for API requests
const axios = require('axios');

async function createInvoice(productName, amount, orderId) {
  try {
    const response = await axios.post(
      'https://api.bingpay.net/payment/invoice',
      {
        name: productName,
        description: "Monthly subscription",
        amount: amount,
        request_id: orderId,
        callback_url: "https://your-site.com/webhook/payment",
        success_url: "https://your-site.com/payment/success",
        cancel_url: "https://your-site.com/payment/cancel"
      },
      {
        headers: {
          'Content-Type': 'application/json',
          'X-API-KEY': 'your_merchant_api_key_here'
        }
      }
    );

    return response.data.data.url_payment;
  } catch (error) {
    console.error("Error creating invoice:", error.message);
    throw error;
  }
}

import requests

def create_invoice(product_name, amount, order_id):
    url = "https://api.bingpay.net/payment/invoice"
    headers = {
        "Content-Type": "application/json",
        "X-API-KEY": "your_merchant_api_key_here"
    }

    payload = {
        "name": product_name,
        "description": "Monthly subscription",
        "amount": amount,
        "request_id": order_id,
        "callback_url": "https://your-site.com/webhook/payment",
        "success_url": "https://your-site.com/payment/success",
        "cancel_url": "https://your-site.com/payment/cancel"
    }

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

    if response.status_code == 200:
        data = response.json()
        return data["data"]["url_payment"]
    else:
        raise Exception(f"Error {response.status_code}: {response.text}")

<?php
function createInvoice($productName, $amount, $orderId) {
    $url = "https://api.bingpay.net/payment/invoice";

    $data = [
        "name" => $productName,
        "description" => "Monthly subscription",
        "amount" => $amount,
        "request_id" => $orderId,
        "callback_url" => "https://your-site.com/webhook/payment",
        "success_url" => "https://your-site.com/payment/success",
        "cancel_url" => "https://your-site.com/payment/cancel"
    ];

    $headers = [
        'Content-Type: application/json',
        'X-API-KEY: your_merchant_api_key_here'
    ];

    $ch = curl_init($url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($data));

    $response = curl_exec($ch);
    curl_close($ch);

    $responseData = json_decode($response, true);
    return $responseData["data"]["url_payment"];
}

import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Scanner;
import org.json.JSONObject;

public String createInvoice(String productName, String amount, String orderId) 
    throws Exception {
    URL url = new URL("https://api.bingpay.net/payment/invoice");
    HttpURLConnection conn = (HttpURLConnection) url.openConnection();
    conn.setRequestMethod("POST");
    conn.setRequestProperty("Content-Type", "application/json");
    conn.setRequestProperty("X-API-KEY", "your_merchant_api_key_here");
    conn.setDoOutput(true);

    JSONObject data = new JSONObject();
    data.put("name", productName);
    data.put("description", "Monthly subscription");
    data.put("amount", amount);
    data.put("request_id", orderId);
    data.put("callback_url", "https://your-site.com/webhook/payment");
    data.put("success_url", "https://your-site.com/payment/success");
    data.put("cancel_url", "https://your-site.com/payment/cancel");

    try(OutputStream os = conn.getOutputStream()) {
        os.write(data.toString().getBytes("UTF-8"));
    }

    Scanner scanner = new Scanner(conn.getInputStream());
    String responseBody = scanner.useDelimiter("\\A").next();
    scanner.close();

    JSONObject response = new JSONObject(responseBody);
    return response.getJSONObject("data").getString("url_payment");
}

using System.Net.Http;
using System.Text;
using System.Text.Json;
using System.Threading.Tasks;

public async Task<string> CreateInvoiceAsync(string productName, 
    string amount, string orderId)
{
    using (var client = new HttpClient())
    {
        client.DefaultRequestHeaders.Add("X-API-KEY", 
            "your_merchant_api_key_here");
        
        var request = new
        {
            name = productName,
            description = "Monthly subscription",
            amount = amount,
            request_id = orderId,
            callback_url = "https://your-site.com/webhook/payment",
            success_url = "https://your-site.com/payment/success",
            cancel_url = "https://your-site.com/payment/cancel"
        };

        var content = new StringContent(
            JsonSerializer.Serialize(request), 
            Encoding.UTF8, 
            "application/json"
        );

        var response = await client.PostAsync(
            "https://api.bingpay.net/payment/invoice", 
            content
        );
        
        response.EnsureSuccessStatusCode();
        var responseBody = await response.Content.ReadAsStringAsync();
        var data = JsonDocument.Parse(responseBody);
        
        return data.RootElement
            .GetProperty("data")
            .GetProperty("url_payment")
            .GetString();
    }
}