The developer's guide describes the requirements and installation instructions for the MM7 Application Program Interface (API), sample client application and an MM7 protocol simulator. The MM7 API provides an MM7 interface between the Value Added Service Provider (VASP) (Client) and the MMC (MMS-C). It also contains an overview of the application programming interface for VASP Multimedia Messaging services. This document describes the functionality the API provides to the VASP applications.