## Specify the coin checker interface

In this section the required ICoinCheck interface is specified. To avoid long execution times, the VendingMachine.prj file might be simplified such that it only contains the monitoring task for the IService interface.

Folder ICoinCheck already contains the following files:

- ICoinCheck.signature with the signature of the coin checker.

- ICoinCheck.interface with a dummy state machine that will be extended in the following activities.