# Introduction

This document defines interface supported by the SIMS GATEWAY API as means of data exchange with SIMS GATEWAY and third-party systems. Also, it includes some message samples that will be produced during actual data transfer.

This document assumes a third-party or Client has an account with NMB Bank, SIMS GATEWAY, and his/her account configured with a link to forward the collection transactions.

SIMS/SARIS GATEWAY uses the first six(6) character of the reference number to identify the client account.

## Communication Protocol

The transport protocol of this interface is JSON over HTTPS. The expected HTTPS method is always POST


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.mpayafrica.co.tz/master.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.