Retrieve the Mxit user's cover image
        No user authentication required

def get_cover_image(self, output_file_path=None, scope='profile/public'):
        """
        Retrieve the Mxit user's cover image
        No user authentication required
        """
        data = _get(
            token=self.oauth.get_user_token(scope),
            uri='/user/cover'
        )

        if output_file_path:
            with open(output_file_path, 'w') as f:
                f.write(data)
        else:
            return data