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

# Overview

> API reference for the Moment platform

Everything you need to integrate with Moment, from API authentication and error handling to product-specific endpoints and webhooks.

<Card title="Quickstart" icon="bolt" href="/api-reference/getting-started/quickstart">
  Get your API key and webhook endpoint set up, then pick your integration path.
</Card>

***

## Foundational Concepts

<div className="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-2 gap-6">
  <Card title="Authentication" icon="key" href="/api-reference/getting-started/authentication">
    How to authenticate requests using API keys.
  </Card>

  <Card title="Idempotency" icon="rotate-left" href="/api-reference/getting-started/idempotency">
    How to safely retry requests without creating duplicates.
  </Card>

  <Card title="Errors" icon="circle-exclamation" href="/api-reference/getting-started/errors">
    Error response structure and common error codes.
  </Card>

  <Card title="Monetary Amounts" icon="coins" href="/api-reference/getting-started/monetary_amounts">
    How amounts and currencies are represented in the API.
  </Card>

  <Card title="Metadata" icon="tags" href="/api-reference/getting-started/metadata">
    Attach custom key-value data to any resource.
  </Card>
</div>

***

## APIs

<div className="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-2 gap-6">
  <Card title="Collect" icon="arrow-right-arrow-left" href="/api-reference/collect/overview">
    Payment Sessions, Payment Links, and Payments APIs.
  </Card>

  <Card title="Billing" icon="file-invoice" href="/api-reference/billing/overview">
    Customers, Accounts, and Bills APIs.
  </Card>

  <Card title="Webhooks" icon="bolt" href="/api-reference/webhooks/overview">
    Event notifications for all Moment resources.
  </Card>
</div>

***

## Technical Reference

<div className="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-2 gap-6">
  <Card title="Integration Testing" icon="flask" href="/api-reference/getting-started/testing">
    Simulate payments and test your integration before going live.
  </Card>

  <Card title="URL Parameters" icon="link" href="/api-reference/getting-started/url_params">
    Track marketing campaign attributes using URL parameters on bill presentment.
  </Card>
</div>