<?php use PaymentGateway\Client\Client; use PaymentGateway\Client\Data\Customer; use PaymentGateway\Client\Transaction\Debit; use PaymentGateway\Client\Transaction\Result; // Include the autoloader (if not already done via Composer autoloader) require_once('path/to/initClientAutoload.php'); // Instantiate the "PaymentGateway\Client\Client" with your credentials $client = new Client("username", "password", "apiKey", "sharedSecret"); $customer = new Customer(); $customer->setBillingCountry("AT")	->setEmail("customer@email.test"); $debit = new Debit(); // define your transaction ID: e.g. 'myId-'.date('Y-m-d').'-'.uniqid() $merchantTransactionId = 'your_transaction_id'; // must be unique $debit->setTransactionId($merchantTransactionId)	->setSuccessUrl($redirectUrl)	->setCancelUrl($redirectUrl)	->setCallbackUrl($callbackUrl)	->setAmount(10.00)	->setCurrency('EUR')	->setCustomer($customer); // send the transaction $result = $client->debit($debit); // now handle the result if ($result->isSuccess()) { //act depending on $result->getReturnType() $gatewayReferenceId = $result->getReferenceId(); //store it in your database if ($result->getReturnType() == Result::RETURN_TYPE_ERROR) { //error handling $errors = $result->getErrors(); //cancelCart(); } elseif ($result->getReturnType() == Result::RETURN_TYPE_REDIRECT) { //redirect the user header('Location: '.$result->getRedirectUrl()); die; } elseif ($result->getReturnType() == Result::RETURN_TYPE_PENDING) { //payment is pending, wait for callback to complete //setCartToPending(); } elseif ($result->getReturnType() == Result::RETURN_TYPE_FINISHED) { //payment is finished, update your cart/payment transaction //finishCart(); } }