Skip to main content

Documentation Index

Fetch the complete documentation index at: https://devzone.nayax.com/llms.txt

Use this file to discover all available pages before exploring further.

The Marshall Pro protocol uses a unified JSON structure for every message. This consistency allows you to build a single “wrapper” in your code to handle all terminal communications.

​
Request Object

Every command sent from your system to the VPOS must follow this structure:
FieldTypeRequiredDescription
commandstringYesThe name of the API method (e.g., "status", "pay").
requestIdstringYesA unique ID used to track the response.
dataobjectNoA container for the specific parameters of the command.

​
Request Example

{
  "command": "<command_name>",
  "requestId": "<unique_request_id>",
  "data": {
    "param1": "value1",
    "param2": "value2"
  }
}

​
Response Object

The terminal’s response always mirrors your requestId so your system knows exactly which command is being answered.

​
Success Response

If the command is processed successfully, the terminal returns the requested information inside the data object. 
{
  "requestId": "<request_id_echo>",
  "data": {
    "status": "success",
    "details": "..."
  }
}

​
Error Response

If an issue occurs, the response will include an error code and a descriptive message. 
{
  "requestId": "<request_id_echo>",
  "errorCode": 400,
  "errorMessage": "Invalid command parameters"
}