Adds some additional information to payment result, such as time stamp and payment method name.

Compares payment data (seller email, total price, payment currency) to order data and returns appropriate error message if data don't match, otherwise returns empty string.

Confirms payment - post the data that was posted to the merchant back to PayPal and returns PayPal response as result of payment confirmation. Returns "VERIFIED" - payment data match, "INVALID" - payment data don't match.

Creates PayPal payment result object.

Builds an order description from the order data which is attached to the payment request.

Adds payment gateway custom data to the specified shopping cart step.

Returns payment gateway url.

Adds payment gateway custom data to the current shopping cart step - payment gateway form with initialized custom controls is added by default.

Fills input name-value collection with payment request parameters' names and their values. Values are not URL-encoded.

Checks whether specified user is authorized to finish payment.

Process payment gateway custom data of the current shopping cart step - payment gateway form data processing is performed by default.

Process payment - initialize payment request and redirect to the PayPal payment gateway to finish payment.

Updates order payment result in database.

Assigns order status to order. If can not be used due to global objects settings, looks for site status with the same code name.

Validates payment gateway custom data of the current shopping cart step - payment gateway form data validation is performed by default.