Abstract: A computer-implemented method for payment status verification of one or more selected products, the method comprising the steps of: receiving a unique transaction code by a checkout module, the unique transaction code being associated with one or more paid products; retrieving, from a database, a product identifier of each of the one or more paid products based on the received unique transaction code; receiving, by the checkout module, at least one product identifier of the one or more selected products; and verifying, using a verification module which is in communication with the checkout module, the payment status of the one or more selected products based on a comparison of the at least one received product identifier of the one or more selected products with the retrieved product identifier of the one or more paid products.

Abstract: A system for facilitating a payment using a client application executed by a client device, the system including one or more processing devices in communication with the client device via a communications network, wherein the one or more processing devices execute processing device software that cause the one or more processing devices to communicate with the client application to establish a transaction session having a session access token and a session key, receive requests from the client application, at least some of the requests including the access token a payload encrypted at least in part using the session key, decrypt the payload at least in part using the session key, process the requests at least in part using the access token and in accordance the decrypted payload, to thereby allow at least one action to be performed, the at least one action forming part of a payment process and provide any required response to the client application.