// ### Transaction
// A transaction defines the contract of a
// payment - what is the payment for and who
// is fulfilling it.
$transaction = new Transaction();
$transaction->setAmount($amount)->setDescription("Payment description");
// ### Redirect urls
// Set the urls that the buyer must be redirected to after
// payment approval/ cancellation.
$baseUrl = getBaseUrl();
$redirectUrls = new RedirectUrls();
$redirectUrls->setReturnUrl("{$baseUrl}/ExecutePayment.php?success=true")->setCancelUrl("{$baseUrl}/ExecutePayment.php?success=false");
// ### Payment
// A Payment Resource; create one using
// the above types and intent set to 'sale'
$payment = new FuturePayment();
$payment->setIntent("authorize")->setPayer($payer)->setRedirectUrls($redirectUrls)->setTransactions(array($transaction));
// ### Get Refresh Token
// You need to get a permanent refresh token from the authorization code, retrieved from the mobile sdk.
// authorization code from mobile sdk
$authorizationCode = 'EJfRuAqXEE95pdVMmOym_mftTbeJD03RBX-Zjg9pLCAhdLqLeRR6YSKTNsrbQGX7lFoZ3SxwFyxADEZbBOxpn023W9SA0JzSQAy-9eLdON5eDPAyMyKlHyNVS2DqBR2iWVfQGfudbd9MDoRxMEjIZbY';
// Client Metadata id from mobile sdk
// For more information look for PayPal-Client-Metadata-Id in https://developer.paypal.com/docs/api/#authentication--headers
$clientMetadataId = '123123456';
try {
// Exchange authorization_code for long living refresh token. You should store
// it in a database for later use
$refreshToken = FuturePayment::getRefreshToken($authorizationCode, $apiContext);
// Update the access token in apiContext
$payment->updateAccessToken($refreshToken, $apiContext);
// For Sample Purposes Only.
