Before using POS systems and connected PEDs to process transactions on the Adyen payments platform, the PEDs should be authenticated and authorised (at least once) with the Adyen payments platform. The POS system should be able to communicate with the Adyen PSP (https:443 - Internet).
Authentication and authorisation of the POS is done by entering the Adyen provided credentials; after which the POS is authorised. The POS can then authenticate and authorise any PEDs that are connected to it.
Additional calls during transactions might happen between the Payment terminal (PED) and the Cash register (POS). They are communicated in the same way as in the steps StartTransaction (1) and TransactionResult(8) through https:8443 (LAN).