'Use this method to export an invite link to a supergroup or a channel. The bot must be an administrator
in the chat for this to work and must have the appropriate admin rights.
Returns exported invite link as String on success.
:param chat_id: Id: Unique identifier for the target chat or username of the target channel
(in the format @channelusername)
:return:'

def export_chat_invite_link(self, chat_id):

    return apihelper.export_chat_invite_link(self.token, chat_id)
