<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def retrieve_client_credentials(self):
 """Return the client credentials. :returns: tuple(client_id, client_secret) """

        client_id = self.params.get('client_id')
        client_secret = self.params.get('client_secret')
        return (client_id, client_secret)