> For the complete documentation index, see [llms.txt](https://docs.mpayafrica.co.tz/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.mpayafrica.co.tz/master.md).

# 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