Response Codes

The API returns a unified response format for both success and errors. The result.code in the response body is the response code; use code for business logic, not msg.

result structure in response

{
  "result": {
    "code": "S0000",
    "msg": "Success"
  },
  "data": { ... }
}

Field	Type	Description
result.code	string	Response code, see tables below
result.msg	string	Message (may change; use code in logic)

Response code list

Code	Description
S0000	Success
B0001	Duplicate merchant order
B0002	The selected payment method is unavailable
B0003	Invalid payment state
C0000	Invalid request
C0001	Missing required parameter
C0002	Invalid parameter format
C0003	Invalid signature
C0004	Unauthorized merchant
C0005	Order number not found
P0001	Payment is processing. (order created success, pending payment)
P0002	Order status is invalid.
P0003	Insufficient balance.
P0004	Payment was cancelled.
P0005	Merchant or payment configuration is invalid.
P0006	Payment was rejected.
E0000	Internal server error
E0001	External system error