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