File list (Check if you may need any files):
php_nvp_samples
...............\APIError.php
...............\CallerService.php
...............\ChangeLog-nvp.txt
...............\DoAuthorization.php
...............\DoAuthorizationReceipt.php
...............\DoCapture.php
...............\DoCaptureReceipt.php
...............\DoDirectPayment.php
...............\DoDirectPaymentReceipt.php
...............\DoExpressCheckoutPayment.php
...............\DoReauthorization.html
...............\DoReauthorizationReceipt.php
...............\DoVoid.php
...............\DoVoidReceipt.php
...............\GetBalance.php
...............\GetBalanceReceipt.php
...............\GetExpressCheckoutDetails.php
...............\GetTransactionDetails.html
...............\MassPay.html
...............\MassPayReceipt.php
...............\README.html
...............\RefundReceipt.php
...............\RefundTransaction.php
...............\ReviewOrder.php
...............\SetExpressCheckout.php
...............\TransactionDetails.php
...............\TransactionSearch.php
...............\TransactionSearchResults.php
...............\constants.php
...............\index.html
...............\sdk.css