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

# API patterns and tools

> API patterns, conventions, and tooling that keep Lerian integrations stable, scalable, and maintainable.

This section covers the API patterns and tools that keep your integrations stable, scalable, and easy to maintain.

## Available pages

***

<div className="space-y-6 w-full sm:max-w-4xl">
  <Columns cols={2}>
    <Card title="Retries and idempotency" icon="rotate-right" href="/en/reference/retries-idempotency">
      Ensure safe retries and prevent duplicate transactions using idempotency keys.
    </Card>

    <Card title="Metadata" icon="tags" href="/en/reference/metadata">
      Structure and optimize data use with custom metadata fields.
    </Card>

    <Card title="Pagination" icon="layer-group" href="/en/reference/pagination">
      Manage large datasets efficiently while keeping performance high.
    </Card>

    <Card title="Tolerant reader" icon="shield-halved" href="/en/reference/tolerant-reader">
      Build integrations that adapt to changes without breaking.
    </Card>

    <Card title="Default network ports" icon="network-wired" href="/en/reference/default-network-ports">
      Check the default ports used by Midaz and the plugins.
    </Card>

    <Card title="Postman integration" icon="paper-plane" href="/en/reference/postman-integration">
      Use our Postman collection to interact with our APIs.
    </Card>
  </Columns>
</div>


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