This example code is not working. ```php $paymentMethod = $_POST['paymentMethodId']; $response = $gateway->authorize([ 'amount' => '10.00', 'currency' => 'USD', 'description' => 'This is a test purchase transaction.', 'paymentMethod' => $paymentMethod, 'returnUrl' => $completePaymentUrl, 'confirm' => true, ])->send(); ```