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

# Gateway-Specific Guidance

> PSP-specific notes for processing payments through PCI Booking. Required fields, quirks, and configuration for each gateway.

Each PSP has specific requirements for how card data and transaction parameters are formatted. PCI Booking handles these differences automatically, but some PSPs require additional input that only you can provide. This page explains what varies and where to find the details.

## What Varies by Gateway

* **Required fields**. Some PSPs require additional parameters beyond the standard set (e.g. merchant category codes, terminal IDs).
* **Supported operations**. Not all PSPs support every transaction type (charge, authorize, capture, void, refund).
* **Card brand support**. PSP-specific restrictions on accepted card networks.
* **Currency handling**. Minor unit formatting and supported currencies differ by PSP.
* **3D Secure**. Integration patterns for 3DS vary across PSPs.

## Gateway-Specific Documentation

PCI Booking provides guidance for each supported PSP, including the required credential fields, supported operations, and any PSP-specific parameters you need to include in your request.

See the [Additional Guidance for Specific Payment Gateways](/api-reference/process-cards/gateway-guidance) in the API Reference for the full list.

<Info>
  If your PSP is not listed or you need help with a specific integration, contact [support@pcibooking.net](mailto:support@pcibooking.net).
</Info>

## Next Steps

<CardGroup cols={2}>
  <Card title="PSP Credentials" icon="book" href="/account-setup/gateway-credentials">
    Set up and manage your PSP credentials.
  </Card>

  <Card title="Universal Payment Gateway" icon="book" href="/use-tokens/universal-payment-gateway">
    UPG overview and supported operations.
  </Card>
</CardGroup>