Disclosed is an authorisation management server for managing temporary transaction authorisation credentials. A processor of the server is operative with program instructions to (i) receive a temporary authorisation code initiator from a bookings system, the temporary authorisation code initiator indicating that a user of a payment vehicle has made a booking relating to overseas travel and identifying at least one of the user and the payment vehicle. The processor is further operative with the program instructions to (ii) acquire, from the bookings system, travel booking details for the booking, the travel booking details specifying, at least first unique identifier associated with the payment vehicle user, and a first travel segment associated with the unique identifier, (iii) acquire, from the bookings system, confirmation that the travel segment has commenced, and (iv) set the first unique identifier as an authorisation code for authorising e-commerce transactions using the payment vehicle.