public function deleteConsumerAccessToken ( $token, $user_id, $user_is_admin = false )
	{
		if ($user_is_admin)
		{
			$this->query('
						DELETE FROM oauth_server_token
						WHERE ost_token 	 = \'%s\'
						  AND ost_token_type = \'access\'
						', $token);
		}
		else
		{
			$this->query('
						DELETE FROM oauth_server_token
						WHERE ost_token 	 = \'%s\'
						  AND ost_token_type = \'access\'
						  AND ost_usa_id_ref = %d
						', $token, $user_id);
		}
	}