Systems and methods are described for collecting data at a merchant’s point of return for use in processing a merchandise return transaction that is being requested by a customer. The invention further relates to a data processing device, a service provision server, a back-up server and a respective program module for a data processing device, for a service provision server and for a back-up server for the backing-up of data. 25 to 2 times the self-resonance frequency of the transformer. At least a first portion of the user control and display unit is disposed on the door so as to be cooled by a flow of ambient air and so as to shield, when the door is in a closed position, the appliance port from view in a direction perpendicular to the front of the body.