Comment by matteason

How much have you investigated the legality of this? In the EU biometric data is 'special category data' under the GDPR [0] and can only be processed in very limited circumstances unless you have the consent of the data subject [1]

[0] https://www.dataprotection.ie/en/organisations/know-your-obl...

[1] https://gdpr-info.eu/art-9-gdpr/