When a guest completes check-in, their details are saved to your Contacts.
What it does
Submitting a check-in with an e-mail address or phone number creates or updates a contact. If a companion in a group check-in provides their own e-mail, they become their own contact too.
Good to know
Go to Contacts to see guests who have checked in.
A check-in with neither an e-mail nor a phone number is not added to your Contacts.
You don't need to do anything extra to make this happen — it's automatic whenever a guest submits their check-in with contact details.
FAQ
Do I need to export anything myself? No — a matching contact is created or updated for you automatically as soon as a guest (or companion) submits an e-mail or phone number.