Checks if a user is a member of a group channel.
Note: See this page to learn more about channel types.
The following table lists the parameters that this action supports.
Specifies the URL of a channel.
Specifies the unique ID of a user.
If successful, in the response body, this action returns the
is_member property which indicates whether a user is a member of the channel.
Indicates whether the user is a member of the channel.
In the case of an error, an error object is returned. A detailed list of error codes is available here.