PayPal Classic API - Express Checkout

composer.json

{
	"require": {
		"paypal/merchant-sdk-php": "*"
	}
}

config.php

<?php

$config = array(
	'mode' => 'sandbox', // or 'live'

	'acct1.UserName' => 'vendor_api1.example.com',
	'acct1.Password' => 'MW1M19EETX3YJX3Y',
	'acct1.Signature' => 'BcaYf-Baofqt7oxiopZb8bHnZGVRAuoqoUoMH3iALBfE4mOKgUQO4ciK'
);

PayPal Classic API - Express Checkout

This example uses the Merchant PHP SDK of Paypal. To get it, just use composer.

step1.php

<?php
// paypal/merchant-sdk-php required
require_once('vendor/autoload.php');
require_once('config.php');

$setExpressCheckoutRequestDetails = new \PayPal\EBLBaseComponents\SetExpressCheckoutRequestDetailsType();
$setExpressCheckoutRequestDetails->ReturnURL = 'http://domain.com/step2.php?success=1';
$setExpressCheckoutRequestDetails->CancelURL = 'http://domain.com/step2.php?success=0';

$paymentDetail = new \PayPal\EBLBaseComponents\PaymentDetailsType();
$paymentDetail->OrderTotal = new \PayPal\CoreComponentTypes\BasicAmountType('EUR', 10.00);
$paymentDetail->ItemTotal = new \PayPal\CoreComponentTypes\BasicAmountType('EUR', 5.88);
$paymentDetail->TaxTotal = new \PayPal\CoreComponentTypes\BasicAmountType('EUR', 1.12);
$paymentDetail->ShippingTotal = new \PayPal\CoreComponentTypes\BasicAmountType('EUR', 3.00);

$paymentDetail->PaymentAction = 'Sale';
$paymentDetail->OrderDescription = 'This is a test';

$shippingAddress = new \PayPal\EBLBaseComponents\AddressType();
$shippingAddress->Street1 = 'Testweg 1';
$shippingAddress->CityName = 'Köln';
$shippingAddress->PostalCode = '51109';
$shippingAddress->Country = 'DE';

$paymentDetail->ShipToAddress = $shippingAddress;
$setExpressCheckoutRequestDetails->PaymentDetails = array($paymentDetail);

$expressCheckoutReq = new \PayPal\PayPalAPI\SetExpressCheckoutReq();
$expressCheckoutRequest = new \PayPal\PayPalAPI\SetExpressCheckoutRequestType($setExpressCheckoutRequestDetails);
$expressCheckoutReq->SetExpressCheckoutRequest = $expressCheckoutRequest;

$service = new \PayPal\Service\PayPalAPIInterfaceServiceService($config);

$response = $service->SetExpressCheckout($expressCheckoutReq);
var_dump($response); // Helpful if $response->Token is empty, cause an error occured

// Remove 'sandbox.' for live mode
$redirectUrl = 'https://www.sandbox.paypal.com/cgi-bin/webscr?cmd=_express-checkout&token=' . $response->Token . '&useraction=commit';
// We request in this file a token from Paypal. After that we need to redirect the customer to the URL above.
echo "<a href='$redirectUrl'>$redirectUrl</a>";

step2.php

<?php
// paypal/merchant-sdk-php required
require_once('vendor/autoload.php');
require_once('config.php');

if ($_GET['success'] != '1') {
	echo "Request not successful!";
	die;
}

$doExpressCheckoutPaymentReq = new \PayPal\PayPalAPI\DoExpressCheckoutPaymentReq();

$doExpressCheckoutPaymentRequestDetails = new \PayPal\EBLBaseComponents\DoExpressCheckoutPaymentRequestDetailsType();
$doExpressCheckoutPaymentRequestDetails->Token = $_GET['token']; // given from Paypal
$doExpressCheckoutPaymentRequestDetails->PayerID = $_GET['PayerID'];  // given from Paypal

$paymentDetails = new \PayPal\EBLBaseComponents\PaymentDetailsType();
$paymentDetails->OrderTotal = new \PayPal\CoreComponentTypes\BasicAmountType('EUR', 10.00);

$doExpressCheckoutPaymentRequestDetails->PaymentDetails = array($paymentDetails);
$doExpressCheckoutPaymentRequest = new \PayPal\PayPalAPI\DoExpressCheckoutPaymentRequestType($doExpressCheckoutPaymentRequestDetails);
$doExpressCheckoutPaymentReq->DoExpressCheckoutPaymentRequest = $doExpressCheckoutPaymentRequest;

$service = new \PayPal\Service\PayPalAPIInterfaceServiceService($config);
$response = $service->DoExpressCheckoutPayment($doExpressCheckoutPaymentReq);

var_dump($response); // If $response->Ack is 'success', the payment is done.

Thank you so much it is really informative 👍