Performs client login with the provided credentials

def _client(self, id, secret):
        """Performs client login with the provided credentials"""
        url = self.api_url + self.auth_token_url
        auth_string = '%s:%s' % (id, secret)
        authorization = base64.b64encode(auth_string.encode()).decode()
        headers = {
            'Authorization': "Basic " + authorization,
            'Content-Type': "application/x-www-form-urlencoded"
        }
        params = {
            'grant_type': 'client_credentials',
            'response_type': 'token'
        }
        return self.session.post(url, params=params, headers=headers)