Payment Kiosk – API Variant

API Variant Specifications

The device includes:

• HW of the cash register and selected peripherals
• API for the Control of Peripherals
• communication interface for the client application

The custom client application should include:

• GUI displayed on the cash register display
• cash register settings and required fees
• service menu (cash withdrawal, maintenance)
• saving of receipts

The custom application is provided by the customer or can be ordered as a custom development in the Green Center. In this case, it will be priced according to the customer‘s requirements.

Communication Interface

The communication interface for the implementation of a custom application supports:

• gRPC (Remote Procedure Call framework using Protocol Buffers for serialisation and data transfer using HTTP protocol)
• two-way communication and servicing several clients simultaneously
• support for the most commonly used programming languages (C#, C++, Java, Node, PHP, Python, Ruby…)
• description of the interface using .proto files, from which the communication implementation in the selected language is automatically generated

API for the Control of Peripherals

The following actions are available:

• IO peripherals operation
  • buttons
  • navigation arrows
• Payment
  • payment processing (cash/card)
  • cancellation, change of payment method
  • payment progress information
• Printing
  • simple documents (text and 2D code)
  • alignment of individual parts of the document
  • font selection
• Coin holder, banknote reader and recycler
  • information on the cash balance
  • topping up or paying out cash
  • cash register selection
  • ensuring persistence between software reboots
  • management of accepted denominations
• HW status reporting
  • equipment malfunctions
  • low cash balance
  • paper running out in the printer
  • full cash register
  • opened entrance doors
  • removed cash register