CPC Class H04W

Methods for managing security of a payment gateway are provided. In one aspect, a method includes assigning a username and a security key to a merchant. The method includes receiving a transaction request associated with the merchant, wherein the transaction request comprises the username assigned to the merchant, request parameters, and a signature code associated with the merchant, and wherein the signature code comprises the request appended to both the username assigned to the merchant and the security key assigned to the merchant. The method includes determining, in response to receiving the transaction request associated with the merchant, whether the signature code of the request is authentic. The method includes validating the transaction request based on determining that the signature code of the request is authentic. Systems and machine-readable media are also provided.

This disclosure provides aspects and embodiments of methods, services, and platforms for prompting users with a zero account balance to send a callback message to a contact informing the contact that the user cannot call them and asking the contact to call the user. This disclosure further provides location determining platforms and rewards platforms for users.

Methods, computer program products, and systems are presented. The method computer program products, and systems can include, for instance: responsive to a determination that a mobile client computer device is at a location of an item venue, sending to the client computer device prompting data, wherein the client computer device is associated to a user; examining feedback data defined by the user, wherein the feedback data is defined by the user in response to the prompting data; and transmitting to the mobile client computer device second prompting data in dependence on the examining feedback data defined by the user.