Neat, free Audis...
But seriously, which kind of person believes this is a good idea? It is obvious, that Amazon needs to track the vehicle until delivery ( with a system that may or may not be switched off, if not needed) and DHL needs a system to unlock the car. This is not a hard to explain security hole in a server that is invisible for the average person. It is granting physical access to your car to a total stranger. What could possibly go wrong?