Make E-Commerce using Kotlin MVVM

  object Constant {
      const val MERCHAT_ID_MIDTRANS = "YOUR_API_KEY"
      const val CLIENT_KEY_MIDTRANS = "SB-Mid-client-YOUR_API_KEY"
      const val SERVER_KEY_MIDTRANS = "SB-Mid-server-YOUR_API_KEY"
      const val BASE_URL_MIDTRANS = "PHP API SERVER"

      const val KEY_ID_RAZORAPP = "rzp_test_YOUR_API_KEY";
      const val KEY_SECRET_RAZORAPP = "YOUR_API_KEY";
  }

  <?php
  // Set your server key (Note: Server key for sandbox and production mode are different)
  $server_key = 'SB-Mid-server-ADDYOURKEYHERE';
  // Set true for production, set false for sandbox
  $is_production = false;

  $api_url = $is_production ? 
    'https://app.midtrans.com/snap/v1/transactions' : 
    'https://app.sandbox.midtrans.com/snap/v1/transactions';

  // get the HTTP POST body of the request
  $request_body = file_get_contents('php://input');
  // set response's content type as JSON
  header('Content-Type: application/json');
  // call charge API using request body passed by mobile SDK
  $charge_result = chargeAPI($api_url, $server_key, $request_body);
  // set the response http status code
  http_response_code($charge_result['http_code']);
  // then print out the response body
  echo $charge_result['body'];

  /**
   * call charge API using Curl
   * @param string  $api_url
   * @param string  $server_key
   * @param string  $request_body
   */
  function chargeAPI($api_url, $server_key, $request_body){
    $ch = curl_init();
    $curl_options = array(
      CURLOPT_URL => $api_url,
      CURLOPT_RETURNTRANSFER => 1,
      CURLOPT_POST => 1,
      CURLOPT_HEADER => 0,
      // Add header to the request, including Authorization generated from server key
      CURLOPT_HTTPHEADER => array(
        'Content-Type: application/json',
        'Accept: application/json',
        'Authorization: Basic ' . base64_encode($server_key . ':')
      ),
      CURLOPT_POSTFIELDS => $request_body
    );
    curl_setopt_array($ch, $curl_options);
    $result = array(
      'body' => curl_exec($ch),
      'http_code' => curl_getinfo($ch, CURLINFO_HTTP_CODE),
    );
    return $result;
  }