Apple patent application for retail card transactions on mobile devices
patft.uspto.gov
patft.uspto.gov
Does anybody remember: Up to a couple years ago, the Apple stores used to use Windows CE devices to process card sales.
edit: not sure they were CE, but definitely MS Windows based, and if you asked to look at it closer, the associate would generally say they were really busy and walk away.
Unlike with patents if you don't defend a trademark you will lose it. Trademarks and patents are different and I'm curious as to why you're relating them here.
but yes, a trademark is representative of a brand, and it's important for companies to control their brand image, especially companies who are constantly under surveillance by the media like Apple.