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

# Reference

Discover a comprehensive collection of essential data the Yuno API utilizes on this page. Effortlessly access the following categories through the provided links:

<CardGroup cols={3}>
  <Card arrow title="API Enums" icon="brackets-curly" href="/reference/api-enums">
    Centralized Single Source of Truth (SSOT) for core routing enums: `provider_id`, `payment_method_type`, and enrollment flows.
  </Card>

  <Card arrow title="Payment Catalog" icon="credit-card" href="/reference/payment-type-list">
    Deep dive into every supported payment method, categorized by provider and specific channel requirements.
  </Card>

  <Card arrow title="Country Reference" icon="globe" href="/reference/country-reference">
    Complete list of ISO country codes and supported currencies across the Yuno platform.
  </Card>

  <Card arrow title="ECI Indicators" icon="shield-check" href="/reference/eci-indicators-list">
    Electronic Commerce Indicator (ECI) response codes for 3D Secure authentication outcomes.
  </Card>

  <Card arrow title="Airline Information" icon="plane" href="/reference/airline-information">
    Passenger types, loyalty tiers, and airline transaction specifications used in travel checkouts.
  </Card>

  <Card arrow title="Logistics & Shipping" icon="truck" href="/reference/shipping-reference">
    Supported shipping carriers and delivery options for logistics integrations.
  </Card>

  <Card arrow title="Industry Categories" icon="building" href="/reference/industry-category-list">
    Standard industry classifications for merchants and transaction risk models.
  </Card>

  <Card arrow title="Items Categories" icon="cart-shopping" href="/reference/items-category-list">
    Standard classification codes for transaction item categories and digital goods.
  </Card>

  <Card arrow title="Payout Purposes" icon="clipboard-list" href="/reference/purposes-list">
    Standardized regulatory codes explaining the exact intent of payout transfers.
  </Card>

  <Card arrow title="Transaction Category" icon="tags" href="/reference/transaction-category-list">
    Standard groupings for classifying transactions and payment methods.
  </Card>
</CardGroup>

Each link will redirect you to a corresponding information list, granting you quick access to the required details.