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

# Data References

> Reference tables for data types, registration ID formats, and merchant category codes.

<CardGroup cols={3}>
  <Card title="Data Types & Formats" icon="code" href="/data-references/data-types">
    Valid data types and their expected formats for file submissions.
  </Card>

  <Card title="Registration ID Types" icon="id-card" href="/data-references/merchant-registration-id-types">
    Country-specific merchant registration ID types and formats.
  </Card>

  <Card title="Merchant Category Codes" icon="tag" href="/data-references/merchant-category-codes">
    Full list of MCC codes and their descriptions.
  </Card>
</CardGroup>