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

# Introduction

> PayNext is a modern payments platform. Route payments across processors, manage subscriptions, and build checkout experiences—all from a single integration.

## Quickstart guide

<CardGroup cols={4}>
  <Card title="1. Set up sandbox" icon="flask" href="/guides/introduction/testing-and-sandbox">
    Create your account and configure sandbox environment.
  </Card>

  <Card title="2. Connect processor" icon="plug" href="/integrations/overview">
    Add your payment processor in sandbox mode.
  </Card>

  <Card title="3. Configure workflow" icon="shuffle" href="/guides/platform/workflows">
    Build routing rules for your payment methods.
  </Card>

  <Card title="4. Create a plan" icon="tag" href="/guides/platform/plans">
    Define pricing, billing cycles, and trials.
  </Card>

  <Card title="5. Integrate checkout" icon="code" href="/sdk-reference/introduction/getting-started">
    Add the SDK to your app and mount checkout.
  </Card>

  <Card title="6. Set up webhooks" icon="webhook" href="/webhooks/introduction/getting-started">
    Receive real-time payment notifications.
  </Card>

  <Card title="7. Test & go live" icon="rocket" href="/guides/introduction/testing-and-sandbox">
    Validate in sandbox, then switch to production.
  </Card>
</CardGroup>

## Common use cases

<CardGroup cols={3}>
  <Card title="Accept a payment" icon="credit-card" href="/guides/use-cases/accept-a-payment">
    Collect a one-time payment from a new customer using SDK checkout.
  </Card>

  <Card title="Charge returning customers" icon="user" href="/guides/use-cases/charge-returning-customers">
    Bill existing customers using saved payment methods.
  </Card>

  <Card title="Sell subscriptions" icon="calendar-check" href="/guides/platform/subscriptions">
    Launch recurring billing with trials, upgrades, and dunning.
  </Card>

  <Card title="Change subscription plan" icon="arrow-up" href="/guides/use-cases/change-subscription-plan">
    Upgrade, downgrade, or modify active subscriptions.
  </Card>

  <Card title="Recover failed payments" icon="history" href="/guides/use-cases/recover-subscriptions">
    Collect payment for failed renewals and reactivate subscriptions.
  </Card>

  <Card title="Customize checkout" icon="sliders" href="/guides/platform/checkout">
    Control which payment methods display based on customer context.
  </Card>
</CardGroup>

## Explore the documentation

<CardGroup cols={2}>
  <Card title="Core Concepts" icon="lightbulb" href="/guides/introduction/core-concepts">
    Understand how PayNext works—routing, workflows, and checkout.
  </Card>

  <Card title="API Reference" icon="code" href="/api-reference/introduction/getting-started">
    Complete API documentation with request examples and response schemas.
  </Card>

  <Card title="SDK Reference" icon="box" href="/sdk-reference/introduction/getting-started">
    Pre-built checkout components and customization options.
  </Card>

  <Card title="Webhooks" icon="webhook" href="/webhooks/introduction/getting-started">
    Real-time events for payments, subscriptions, and customer updates.
  </Card>
</CardGroup>