> ## 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.

# Overview

Cortina API allows third-party integrators, such as payment providers or Payment Gateways, to process payment transactions securely and efficiently. It acts as a communication layer that enables Nayax’s devices to interact with external payment platforms through well-defined request/response flows.

<Card title="Set Up the MCP Server" icon="robot" href="/docs/get-started/mcp-setup">
  Connect your AI assistant to Nayax documentation for instant answers.
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## Transaction Flow Components

Cortina API sits at the center of the payment flow and ensures each transaction is valid, secure, and fully processed.

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  <img src="https://mintcdn.com/nayax-44d6e37b-docs-marshall-faq-redistribution/sBwRUCoASdSz1DKZ/images/docs/overview-cortina/image1.png?fit=max&auto=format&n=sBwRUCoASdSz1DKZ&q=85&s=dce787ed39f2f6826b6fe2999ccb1cf0" width="1254" height="560" data-path="images/docs/overview-cortina/image1.png" />
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The flow involves four key components:

1. **Customer**: Customers initiate payment by presenting their payment method at the POS (Point of Sale) terminal.
2. **POS (Point of Sale)**: The POS terminal receives the credit card details and the transaction amount. It then sends the card and transaction details to the Nayax server for further processing.
3. **Nayax**: Nayax receives the payment request and uses the Cortina API to verify the transaction. The API handles the transaction's authentication, authorization, and final settlement.
4. **Payment Gateway**: The Payment Gateway processes transaction details, authorizes payments, and clears funds.

Nayax uses the Cortina API to authorize and clear the transaction, keeping the payment valid and secure.

## See Also

See the following pages to learn more about Cortina's payment methods and its integration and support resources.

### Payment Methods

Cortina supports four payment methods, each with its own transaction flow.

<CardGroup cols={3}>
  <Card icon="wallet" title="Prepaid Card" href="/docs/cortina/prepaid-card/prepaid-card-flows">
    Process prepaid card transactions using pre-selection or pre-authorization flows.
  </Card>

  <Card icon="credit-card" title="Credit Card" href="/docs/cortina/credit-card/cortina-credit-card-flows">
    Process credit card payments through pre-selection or pre-authorization flows.
  </Card>

  <Card icon="qrcode" title="StaticQR" href="/docs/cortina/staticqr/staticqr-flows">
    Process wallet payments when customers scan a static QR code on the machine.
  </Card>

  <Card icon="rotate" title="DynamicQR" href="/docs/cortina/dynamicqr/cortina-dynamicqr">
    Process QR payments using a unique code generated for each transaction.
  </Card>
</CardGroup>

### Integration & Support

These pages cover the integration process, authentication, and other supporting resources for your Cortina integration.

<CardGroup cols={3}>
  <Card icon="list-check" title="Integration Process" href="/docs/cortina/cortina-integration">
    Follow Cortina's staged integration process from kickoff through the production pilot.
  </Card>

  <Card icon="lock" title="Authentication Process" href="/docs/cortina/start-session/cortina-auth">
    Encrypt and exchange tokens to authenticate each Cortina transaction session.
  </Card>

  <Card icon="network-wired" title="Network Requirements" href="/docs/cortina/network-requirements">
    Set up HTTPS or VPN connectivity and whitelist Nayax's IP addresses.
  </Card>

  <Card icon="circle-check" title="Sale End Notification" href="/docs/cortina/sale-end-notification">
    Notify your system when a Cortina transaction reaches completion.
  </Card>

  <Card icon="rotate-left" title="Refunds" href="/docs/cortina/refunds">
    Return funds to customers for eligible transactions with full or partial refunds.
  </Card>

  <Card icon="circle-question" title="Cortina FAQs" href="/docs/cortina/cortina-faqs">
    Find quick answers to common questions about Cortina integration, payments, and QR setups.
  </Card>
</CardGroup>

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