6.3.3.1 Overview

A Vending Machine may have several payment devices responsible to handle money, either received from a customer or provided to the customer. Those devices may be handled in a proprietary way by the payment service, or accessed using a standardized OPC UA information model defined in this specification. The type hierarchy for those devices is introduced in 6.2.3. The following clauses describe the interactions between the payment services and the different types of payment devices.