Can someone help me how to figure out where to get this fields Included, purchased, result description and extension using API read call log

Hello Francis,

We have getting started information available in our Quick Start guide, and this also has introductory information for creating calls to fetch Call-Log data.

You can view the data which is returned from requests to our Call-Log API resource in the API Explorer and the RingCentral Developer Guide.

You can obtain call-log data using different routes for different types of results you desire: active-calls, recording data, recording content, call-logs by extension, and you're able to use filters to do things such as request detailed call-log data if you need it.

Have you already created your Sandbox, and defined an application in Developer Portal?