If you go to Settings > Locations > Select location > POS, you will see a setting for Validation Type with the following validations:
Bar Code – The bar code generated on a receipt is scanned by the guest's phone camera in the mobile app to add the checkin.
External UID Validation – GUID validation.
Receipt Image – Receipt image must be submitted to be manually verified by a human verification team.
QR Code – POS scans the quest's QR code from their mobile app during a transaction/checkin.
Business Generated – Business generated validation for non-POS integrated locations.
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