> ## 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

> Indexes all reference lists for enums, payment methods, countries, and other Yuno API data

This page indexes essential reference data used by the Yuno API. Use the links below to find each category:

<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>


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