Returns a list of all CIS Subcontractors along with verification details
Deprecation notice: Accept: application/pdf returns a PDF link and is deprecated. Use Accept: application/octet-stream to retrieve PDF bytes through the authenticated API. The end-of-life date for PDF-link responses is 1st February 2027. Legacy PDF-link responses include Deprecation (RFC 9745 date @<unix-seconds>), Sunset, Warning, and optional Link headers.