> ## Documentation Index
> Fetch the complete documentation index at: https://nayax-44d6e37b-docs-marshall-faq-redistribution.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Forecourt Architecture

The Marshall Pro (Fuel) integrates into a complex ecosystem involving local hardware, forecourt controllers, and multiple backend authorization engines.

<Frame>
  <img src="https://mintcdn.com/nayax-44d6e37b-docs-marshall-faq-redistribution/PpgA-AdAmE5-018b/images/forecourt.png?fit=max&auto=format&n=PpgA-AdAmE5-018b&q=85&s=3b88b524399bb262ee62e3752d629563" alt="Forecourt Architecture" width="1716" height="1050" data-path="images/forecourt.png" />
</Frame>

### The Forecourt (On-Site)

The forecourt consists of the physical hardware interacting with customers and fuel dispensers.

<CardGroup cols={2}>
  <Card title="Pay-at-the-Pump Terminal" icon="gas-pump">
    The Nayax terminal where the **Cardholder** initiates the transaction. It communicates via Cellular, Ethernet, or Wi-Fi.
    To ensure interoperability, the system supports industry-standard protocols:

    * **Marshall Protocol:** For direct device-to-app communication.
    * **IFSF / Conexxus:** Standardized communication for international fuel retail environments.
  </Card>

  <Card title="Forecourt Controller (FCC)" icon="network-wired">
    The "brain" of the site. It manages the **Dispensers** via a Pump Comms Protocol and links them to the POS and Nayax terminal.
  </Card>

  <Card title="Point of Sale (POS)" icon="cash-register">
    The system managing the c-store in the forecourt environment.
  </Card>

  <Card title="Back-office" icon="gears">
    Local servers managing inventory, pricing, and site configuration.
  </Card>
</CardGroup>

## Nayax Payment Server

Beyond the physical site, the **Nayax Payment Server** acts as a central hub, using **Amazon SQS** for reliable message queuing to ensure no transaction data is lost.
The transactions are routed to different engines depending on the card type or customer profile:

* **Fleet Transactions:** Specialized processing for commercial vehicle cards.
* **3rd Party Auth Engine:** Connection to external banking or payment processors.
* **Loyalty Servers:** Validates rewards, discounts, and member-specific pricing.
* **Payment Gateway/Acquirer:** Final settlement for standard consumer credit/debit cards.