curl --location 'https://api.tosspayments.com/v1/brandpay/authorizations/access-token' \
--header 'Authorization: Basic dGVzdF9za ... ==' \
--header 'Content-Type: application/json' \
--data '{
"grantType": "AuthorizationCode",
"code": "test_ck_...",
"customerKey": "customer_0001"
}'
curl --location 'https://api.tosspayments.com/v1/brandpay/authorizations/access-token' \
--header 'Authorization: Basic dGVzdF9za ... ==' \
--header 'Content-Type: application/json' \
--data '{
"grantType": "AuthorizationCode",
"code": "test_ck_...",
"customerKey": "customer_0001"
}'