Its all doable, although not as simple as it sounds and its not the same as POS Solutions.
A bowser is the equivalent of an unattended vending machine. The designers programmers and vendors have to assume that the unit and the system its attached to will be subject to very sophisticated attacks by very capable crooks. They will attack both hardware and software in multiple locations.
There are two parts to the work (1) The hardware and application layer - Yes, already solved and available. (2) The legal side of who wears what risk - and who pays - that's where BP will be concerned.