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The Nayax Marshall SDK includes a simulator to help developers test and debug their device integration with the Nayax payment system. The simulator replicates the behavior of the actual hardware and software interactions, allowing you to validate the vending process without needing physical hardware.

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Simulator

When the C SDK simulator is started on a terminal, its menu will look like this: The table below describes each option on the simulator terminal.
CommandDescription
Start session 0Starts a session (a transaction) with product code 0.
Close Session 0Only relevant in multisession. Closes the session (settles it) at the end of a transaction.
Cancel SessionCancels the transaction from the peripheral’s end. Can be sent up until the consumer’s card has been approved.
Query sessionsGives information about which sessions are currently open. This option is relevant from 4.0.0.22 and above.
Reader stateGives information about whether the reader is enabled (1)/disabled (0). This option is relevant from 4.0.0.22 and above.
Link statsProvides information about the number of CRC errors, packet retransmissions, and communication losses.
QuitQuits the simulator program.

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Transaction Flow Examples

Below are examples of the flow for each transaction type:
  1. Regular Transaction (Single Session):
    1. Start a session: with [0]: Start session.
    2. Present card, wait for authorization and “Thank you” screen.
  2. Multi-Session Transaction:
    1. Start a session with [0]: Start session 0.
    2. Present card, wait for authorization and “Thank you” screen.
    3. Close the relevant session- in this case, use [1]: Close Session 0.

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See Also

C# SDK Simulator

Java SDK Simulator