channel_thread_member

Returns a thread member object for the specified user if they are a member of the thread, returns a 404 response otherwise.

When with_member is set to true, the thread member object will include a member field containing a guild member object

Count	Name	Type	Required
1	channel_id	Snowflake	True
2	user_id	Snowflake	True
3	with_member	Boolean	True