Stripe OAuth Example -- PHP

index.php

<?php
  define('CLIENT_ID', 'YOUR_CLIENT_ID');
  define('API_KEY', 'YOUR_API_KEY');

  define('TOKEN_URI', 'https://connect.stripe.com/oauth/token');
  define('AUTHORIZE_URI', 'https://connect.stripe.com/oauth/authorize');

  if (isset($_GET['code'])) { // Redirect w/ code
    $code = $_GET['code'];

    $token_request_body = array(
      'client_secret' => API_KEY,
      'grant_type' => 'authorization_code',
      'client_id' => CLIENT_ID,
      'code' => $code,
    );

    $req = curl_init(TOKEN_URI);
    curl_setopt($req, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($req, CURLOPT_POST, true );
    curl_setopt($req, CURLOPT_POSTFIELDS, http_build_query($token_request_body));

    // TODO: Additional error handling
    $respCode = curl_getinfo($req, CURLINFO_HTTP_CODE);
    $resp = json_decode(curl_exec($req), true);
    curl_close($req);

    echo $resp['access_token'];
  } else if (isset($_GET['error'])) { // Error
    echo $_GET['error_description'];
  } else { // Show OAuth link
    $authorize_request_body = array(
      'response_type' => 'code',
      'scope' => 'read_write',
      'client_id' => CLIENT_ID
    );

    $url = AUTHORIZE_URI . '?' . http_build_query($authorize_request_body);
    echo "<a href='$url'>Connect with Stripe</a>";
  }
?>

Hi i am getting the following error
array(4) { ["client_secret"]=> string(42) "sk_test_xZZKjDRsPZb0z3KWvOCK0uXf00amK9apPF" ["grant_type"]=> NULL ["client_id"]=> string(35) "ca_HFVybE89S1Jse3hapX45PqAMaCFfI3Mr" ["code"]=> string(35) "ac_HJKaA5JoCzOwofYAxd0OYkYA4qodf78y" } array(2) { ["error"]=> string(15) "invalid_request" ["error_description"]=> string(23) "No grant type specified" }

this is my code:

API_KEY, 'grant_type' => $_GET['authorization_code'], 'client_id' => CLIENT_ID, 'code' => $code, ); var_dump($token_request_body); $req = curl_init(TOKEN_URI); curl_setopt($req, CURLOPT_RETURNTRANSFER, true); curl_setopt($req, CURLOPT_POST, true ); curl_setopt($req, CURLOPT_POSTFIELDS, http_build_query($token_request_body)); // TODO: Additional error handling $resp = json_decode(curl_exec($req), true); $respCode = curl_getinfo($req, CURLINFO_HTTP_CODE); curl_close($req); echo $resp['access_token']; var_dump($resp); } else if (isset($_GET['error'])) { // Error echo $_GET['error_description']; } else { // Show OAuth link $authorize_request_body = array( 'response_type' => 'code', 'scope' => 'read_write', 'client_id' => CLIENT_ID ); $url = AUTHORIZE_URI . '?' . http_build_query($authorize_request_body); echo "Connect with Stripe"; } any help is welcome thank you in advance