After the Owner registers, in My Profile page he will have the option to UPLOAD AN ID SCAN

The Owner will need to upload an image. Save his Profile.

The admin will be notified via email about the new submission.

and will need to go to admin-Users to validate the user ID

On Owner profile, the status Verified will be displayed below his profile image.

The Verified badge will show in the featured owner shortcode 

The Owner will not be able to change his ID, unless admin unticks the option from Users account (admin)