Get the payment Object by passing paymentId payment id was previously stored in session in CreatePaymentUsingPayPal.php
PaymentExecution object includes information necessary to execute a PayPal account payment. The payer_id is added to the request query parameters when the user is redirected from paypal back to your site
(See bootstrap.php for more on ApiContext
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Execute Payment Sample
This sample shows how you can complete a payment that has been approved by the buyer by logging into paypal site. You can optionally update transaction information by passing in one or more transactions. API used: POST '/v1/payments/payment//execute'.