url:https://api.tosspayments.com/v1/brandpay/authorizations/access-token headers:{'Authorization': 'Basic dGVzdF9za19Zb0VqYjBnbTIzUGptekJXd0dOcnBHd0JKbjVlOg==', 'Content-Type': 'application/json'} data:{'grantType': 'AuthorizationCode', 'customerKey': 'r2vava', 'code': 'kKEypNArWbB5WNbNQVlmeaxY'} 500 response:{"code":"COMMON_ERROR","message":"일시적인 오류가 발생했습니다. 잠시 후 다시 시도해주세요."}