What personal data do my guests end up giving Snaptide?

When a guest registers for an album they provide their name and an email or phone number, and they tick a consent box for facial recognition processing. They also upload a selfie, which is used for matching. So the data footprint is: contact details, a consent record, and a face image used transiently for matching. Nothing exotic, but it's real personal data — which is exactly why the consent checkbox exists and why you as the photographer are expected to handle it responsibly.