APIC-EM API reference Documentation in detail

Trying to make a demo application of APIC-EM using Devnet Sandbox. Could you give me APIC-EM API reference Documentation in detail. Want to know Request/Response Payload Parameters(Type, Attribute Name and Description) as like as PI.

 PI API detailed reference on Cisco.com

http://www.cisco.com/c/dam/en/us/td/docs/net_mgmt/prime/infrastructure/3-0/api_reference/guide/cpi_apiref30.zip

PI API detailed reference on Devnet

https://developer.cisco.com/site/prime-infrastructure/documents/api-reference/tutorial/

already refered these API Documentation.

Cisco DevNet: APIC Enterprise Module (EM) - API Reference Guide

I want to know parameter discription. For example, what does "networkUser" mean in POST/Policy?

Better API documentation will be available when the GA release happens.  I had some similar struggles integrating with APIC-EM.  What I found useful was to use the GET method to try and understand what was there in terms of property values, then use similar values when doing POST/PUT.