If your application is a native application (written in C/C++, for example), or is written in a language which can make calls to shared/dynamic-link libraries, then PLUSNative is the API designed for your needs (see more about selecting a solution).
The PLUSNative API reference is meant to provide very detailed documentation specifically for the PLUSNative API. Higher-level, instructional information is available, and better explains how to use the PLUSNative API in your applications.