> ## Documentation Index
> Fetch the complete documentation index at: https://payblis.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Parameters Reference

This section lists all required parameters for the Legacy integration method, which uses a Base64-encoded and HMAC-signed payload to redirect customers to the Payblis hosted payment page.

| **Parameter**       | **Type** | **Description**                  | **Required** |
| ------------------- | -------- | -------------------------------- | ------------ |
| MerchantKey         | `String` | Your merchant identification key | Yes          |
| sandbox             | `true`   | Only for TEST MODE               | No           |
| provider\_or        | `String` | API\_NAME (pb-banxa...)          | Yes          |
| amount              | `String` | Transaction amount (XX.XX)       | Yes          |
| currency            | `String` | Currency  (EUR,USD,CAD, GBP )    | Yes          |
| product\_name       | `String` | Product name                     | Yes          |
| method\*            | `String` | Payment method                   | Yes          |
| RefOrder            | `String` | Unique order reference           | Yes          |
| Country             | `String` | ISO code (FR,DE,UK....)          | Yes          |
| Customer\_Email     | `String` | Customer's email                 | Yes          |
| Customer\_Name      | `String` | Customer's name                  | Yes          |
| Customer\_FirstName | `String` | Customer's first name            | Yes          |
| store\_name         | `String` | Store/business name              | Yes          |
| urlOK               | `String` | Success callback URL             | Yes          |
| urlKO               | `String` | Failure callback URL             | Yes          |
| ipnURL              | `String` | IPN callback URL                 | Yes          |
| signature           | `String` | HMAC-SHA256 signature            | Yes          |

\*Value = credit\_cards,apple\_pay,google\_pay,paypal,revolut,sepa,open\_banking