# Quality Control

> Pre-close and post-close quality control — submit loans, retrieve findings, and track QC status.

## OpenAPI specs
- [Authentication](https://developers.snapdocs.com/content/qc/specs/authentication.json)
- [QC API](https://developers.snapdocs.com/content/qc/specs/qc-api.json)

## Shared platform guides
Authentication, environments, webhooks, and testing are shared across every Snapdocs product — see [Getting Started](https://developers.snapdocs.com/platform/llms.txt).

## Guides
- [Welcome to Quality Control API](https://developers.snapdocs.com/content/qc/guides/guides/getting_started.md)
- [Environments & Introduction](https://developers.snapdocs.com/content/qc/guides/guides/environments_introduction.md)
- [Subscription & Webhooks](https://developers.snapdocs.com/content/qc/guides/guides/subscription_webhooks.md)
- [Documents Glossary](https://developers.snapdocs.com/content/qc/guides/guides/documents_glossary.md)
- [Security](https://developers.snapdocs.com/content/qc/guides/guides/security.md)

## Pre-Close QC
- [Pre-Close QC](https://developers.snapdocs.com/content/qc/guides/pre-close/pre_close_qc.md)

## Post-Close QC
- [Post-Close QC](https://developers.snapdocs.com/content/qc/guides/post-close/post_close_qc.md)