| Merchant Code | Unique Merchant ID, also known as Merchant Number. |
| Account ID | Sub account assigned under merchant account, also known as subaccount ID, gateway number. |
| Secret Key | Parameter name "sign_key", key generated for each Account_id. |
| Return URL | Parameter name: "return_url". A merchant customized HTTP URL where the payment result message will be returned to after a payment process is finished (for Redirect interface). |
| Notify URL | Parameter name: "notify_url". A merchant customized HTTP URL where the notifications will be sent to. |