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

# Certificates

SAT certificate resources represent e.firma and CSD certificates discovered for an entity. Each certificate includes the serial number, certificate type, issuer, subject, validity dates, SAT status, revocation date when available, and a file reference for the certificate content.

List certificates for an entity when you need to inspect which certificates SAT has associated with that entity. Retrieve a certificate by ID when you need the certificate metadata or the file reference for download.

## How SAT certificate data is collected

SAT certificate records are collected with the `sat_certificates` extractor. After the extraction finishes, the resulting records are available from the entity SAT certificate list.

For implementation details, see [Extraction request examples](/developers/extraction-request-examples#sat-certificates).