You're seeing just the function
set_purpose, go back to SlackWeb.Channels module for more information.
Sets the purpose for a channel.
channel- Channel to set the purpose of
purpose- The new purpose ex:
Errors the API can return:
channel_not_found- Value passed for
is_archived- Channel has been archived.
not_in_channel- Authenticated user is not in the channel.
too_long- Purpose was longer than 250 characters.
user_is_restricted- Setting the purpose is a restricted action.