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For example, I want to make the Glip API request /restapi/v1.0/glip/persons/{personid},
how to find the value of the user "personid" in Glip?
I have a user in Glip but his "ID" did not find it, as well as the data "ID" of his group (team).

Here is the API for Glip: https://developer.ringcentral.com/api-docs/latest/index.html#!#GlipApi.html

You request for group and person information using the API.

As John said, if you setup WebHook / PubNub  to receive Glip events, there should be GroupId in the event message. 

What type of app are you trying to create?

• In a bot application, your bot will receive an event with a groupID which can be used to retrieve a list of personIds in the group.
• If you want to post directly, you can retrieve a list of groups with groupIds with associated personIds.