#485 - Remove unnecessary methods that are unused now that payment modules have gone away
#485 - Remove already-commented out AOP xml config, move the AOP transaction config for blSecurePU down to @Transactional annotations
#485 - Add a rawResponse to PaymentTransaction
#485 - Update some comments in the common payment DTOs, add stub implementation of blPaymentGatewayGatewayCheckoutService
#485 #408 - Allow payments and payment transactions to be soft-deleted
#485 - Remove the PaymentResponseItem entity. Functionality should actually be eclipse by that of the PaymentTransaction
#485 - Complete most of the stubbing for converting a payment response DTO into a payment and transaction to add to the order