| SID | 000000000000010 | String | YES | Merchant Store ID in the myPOS system. |
| WalletNumber | 61938166610 | String | YES | Merchant myPOS wallet number. |
| KeyIndex | 1 | Int | YES | Index of the RSA key used for signing. |
| OrderID | 20120331999999 | String | YES | Unique order identifier from the merchant system. |
| Amount | 23.45 | Double | YES | Payment amount. |
| Currency | EUR | A(3) | YES | ISO 3-character currency code. |
| CartItems | 1 | Int | YES | Number of items included in the cart. |
| Article_1 | Premium plan | String | Conditional | Name of the cart item (repeat per item index). |
| Quantity_1 | 1 | Double | Conditional | Quantity for the cart item (repeat per item index). |
| Price_1 | 23.45 | Double | Conditional | Unit price of the cart item (repeat per item index). |
| Currency_1 | EUR | A(3) | Conditional | Currency of the cart item (repeat per item index). |
| Amount_1 | 23.45 | Double | Conditional | Total amount for the cart item (repeat per item index). |
| ApplePayToken | PKPaymentToken | JSON | YES | Wallet token generated by the user device. |
| AppleMerchantID | merchant.com.example | String | YES | Apple Merchant ID registered with Apple. |
| Note | Order #12345 | String | NO | Optional note attached to the transaction. |
| AccountSettlement | 0000000000 | String | NO | Settlement to a specific merchant account. |
| Developer key | partner_key | String | NO | Used for Partners Program integrations. |
| Output | json | String | NO | Response format. Supported values: xml or json. |