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

# Basics

The following API articles provide an understanding for high level API methodology across the different Invoca APIs.

* [Design Principles](https://docs.invoca.com/developers/2022-08-01/basics/design_principles.md)
  * [REST](https://docs.invoca.com/developers/2022-08-01/basics/design_principles.md#rest)
  * [Status Codes](https://docs.invoca.com/developers/2022-08-01/basics/design_principles.md#status-codes)
  * [Security](https://docs.invoca.com/developers/2022-08-01/basics/design_principles.md#security)
  * [Idempotency](https://docs.invoca.com/developers/2022-08-01/basics/design_principles.md#idempotency)
  * [Self‐Correction](https://docs.invoca.com/developers/2022-08-01/basics/design_principles.md#selfcorrection)
  * [Versioning](https://docs.invoca.com/developers/2022-08-01/basics/design_principles.md#versioning)
  * [Dedicated Subdomain](https://docs.invoca.com/developers/2022-08-01/basics/design_principles.md#dedicated-subdomain)
  * [Request Parameter Format & Response Body Format](https://docs.invoca.com/developers/2022-08-01/basics/design_principles.md#request-parameter-format-response-body-format)
* [Error Handling](https://docs.invoca.com/developers/2022-08-01/basics/error_handling.md)
  * [Common RingPool errors:](https://docs.invoca.com/developers/2022-08-01/basics/error_handling.md#common-ringpool-errors)
* [SAML Single Sign-On](https://docs.invoca.com/developers/2022-08-01/basics/saml_single_sign_on.md)


## Related topics

- [Basic Knowledge: Integrations](https://docs.invoca.com/s/article/basic-knowledge-integrations.md)
- [Basic Knowledge: Invoca Webhooks](https://docs.invoca.com/s/article/webhooks-setup.md)
- [Piwik PRO: Setup & Overview](https://docs.invoca.com/s/article/piwik-setup-overview.md)
- [Salesforce Sales Cloud: Integration Overview](https://docs.invoca.com/s/article/salesforce-sales-cloud-integration-overview.md)
- [Design Principles](https://docs.invoca.com/developers/2022-08-01/basics/design_principles.md)