QR codes on certificates
QR codes are embedded in every certificate automatically during PDF creation. No setup is needed — the QR library ships with the plugin.
Where the QR code points
Each QR code links to the public verification page on your site (/verify-certificate/), where anyone can confirm the certificate is authentic.
Because the link points to your own site, it only works for other people once the site is publicly reachable.
Overview: Online certificate verification by QR code and serial number