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

# Payment Flows

The Nayax Marshall SDK offers a diverse range of payment flows, each designed to meet specific operational needs and dictate precisely how your system handles vending sessions, payment authorizations, and transaction processing.

The following pages provide a more detailed description of each one:

## Single Session Flows

<CardGroup cols={3}>
  <Card icon="hand-pointer" title="Single Session with Pre-Selection" href="/docs/integrate-pos-device/marshall/payment-flows/marshall-single-session-with-pre-sel">
    Separate product selection from payment authorization in a single transaction.
  </Card>

  <Card icon="shield-check" title="Single Session with Pre-Authorization" href="/docs/integrate-pos-device/marshall/payment-flows/marshall-single-session-with-pre-auth">
    Approve payment before the customer selects a product to minimize risk.
  </Card>

  <Card icon="server" title="Single Session Pre-Authorization with External Settlement" href="/docs/integrate-pos-device/marshall/payment-flows/external-settlement-marshall">
    Let a third-party server trigger final settlement or cancellation.
  </Card>
</CardGroup>

## Multi-Vend Flows

<CardGroup cols={2}>
  <Card icon="cart-shopping" title="Multi-Vending with Pre-Selection" href="/docs/integrate-pos-device/marshall/payment-flows/marshall-multi-vend-with-pre-sel">
    Dispense multiple selected products after the customer completes one payment.
  </Card>

  <Card icon="layer-group" title="Multi-Vending with Pre-Authorization" href="/docs/integrate-pos-device/marshall/payment-flows/marshall-multi-vend-with-pre-auth">
    Let customers buy multiple products after a single upfront authorization.
  </Card>
</CardGroup>

## Multi-Session Flows

<CardGroup cols={2}>
  <Card icon="users" title="Multi-Session" href="/docs/integrate-pos-device/marshall/payment-flows/marshall-multi-session">
    Separate product selection from authorization and settlement across sessions.
  </Card>

  <Card icon="network-wired" title="Multi-Session Pre-Authorization with External Settlement" href="/docs/integrate-pos-device/marshall/payment-flows/multi-session-pre-authorization-with-external-settlement">
    Manage multiple parallel transactions with an external settlement server.
  </Card>
</CardGroup>

## Additional Flows & Features

<CardGroup cols={3}>
  <Card icon="puzzle-piece" title="Sub Flows & Features" href="/docs/integrate-pos-device/marshall/payment-flows/sub-flows-features">
    Start a transaction from product selection when full pre-selection isn't available.
  </Card>
</CardGroup>

## Recommended Flows

If you are unsure which flow is ideal for your machine type, the following table shows the recommended flow and configuration.

| Machine Type          | Recommended Flow                                                                                                                                                                          | Recommended Configuration                                           |
| --------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------- |
| Vending Machine       | [Single Session + Pre-Selection](/docs/integrate-pos-device/marshall/payment-flows/marshall-single-session-with-pre-sel)                                                                  | Always Idle                                                         |
| Coin Exchanger        | [Single Session + Pre-Selection](/docs/integrate-pos-device/marshall/payment-flows/marshall-single-session-with-pre-sel)                                                                  | Always Idle                                                         |
| Cotton Candy          | [Single Session + Pre-Selection](/docs/integrate-pos-device/marshall/payment-flows/marshall-single-session-with-pre-sel)                                                                  | Always Idle + Explicit Vend Success                                 |
| Photo Booth           | [Single Session + Pre-Selection](/docs/integrate-pos-device/marshall/payment-flows/marshall-single-session-with-pre-sel)                                                                  | Always Idle                                                         |
| Coffee Machine        | [Single Session + Pre-Selection](/docs/integrate-pos-device/marshall/payment-flows/marshall-single-session-with-pre-sel)                                                                  | Always Idle                                                         |
| Massage Chair         | [Single Session + Pre-Selection](/docs/integrate-pos-device/marshall/payment-flows/marshall-single-session-with-pre-sel)                                                                  | Always Idle                                                         |
| Car Washing Machine   | [Single Session + Pre-Selection](/docs/integrate-pos-device/marshall/payment-flows/marshall-single-session-with-pre-sel)                                                                  | Always Idle                                                         |
| EV Charger 1          | [Multi Session](/docs/integrate-pos-device/marshall/payment-flows/marshall-multi-session)                                                                                                 | Price not final                                                     |
| EV Charger 2          | [Multi Session](/docs/integrate-pos-device/marshall/payment-flows/marshall-multi-session)                                                                                                 | Price not final + Mifare approved by VMC                            |
| EV Charger 3          | [Multi Session](/docs/integrate-pos-device/marshall/payment-flows/marshall-multi-session)                                                                                                 | Price not final + Mifare approved by VMC + Info Session             |
| EV Charger 4          | [Multi Session](/docs/integrate-pos-device/marshall/payment-flows/marshall-multi-session)                                                                                                 | Price not final + Mifare approved by VMC + Info Session + Always On |
| Smart Fridge          | [Multi Session](/docs/integrate-pos-device/marshall/payment-flows/marshall-multi-session)+ [Sub flows / features](/docs/integrate-pos-device/marshall/payment-flows/sub-flows-features#/) | Price not final + Always On                                         |
| Power Bank            | [Multi Session](/docs/integrate-pos-device/marshall/payment-flows/marshall-multi-session)+ [Sub flows / features](/docs/integrate-pos-device/marshall/payment-flows/sub-flows-features#/) | Price not final + Always On                                         |
| Locker                | [Multi Session](/docs/integrate-pos-device/marshall/payment-flows/marshall-multi-session)                                                                                                 | Price not final                                                     |
| Racket Rental Machine | [Multi Session](/docs/integrate-pos-device/marshall/payment-flows/marshall-multi-session)                                                                                                 | Price not final + Always Idle                                       |

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