setUserInfo('YOUR_LOGIN', 'YOUR_SECRET_KEY'); // Specify the url where authorize.net will send the user on success/failure $myAuthorize->addField('x_Receipt_Link_URL', 'http://YOUR_HOST/payment/authorize_success.php'); // Specify the url where authorize.net will send the IPN $myAuthorize->addField('x_Relay_URL', 'http://YOUR_HOST/payment/authorize_ipn.php'); // Specify the product information $myAuthorize->addField('x_Description', 'T-Shirt'); $myAuthorize->addField('x_Amount', '9.99'); $myAuthorize->addField('x_Invoice_num', rand(1, 100)); $myAuthorize->addField('x_Cust_ID', 'muri-khao'); // Enable test mode if needed $myAuthorize->enableTestMode(); // Let's start the train! $myAuthorize->submitPayment();