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When reservation contacts are added to a reservation we automatically create a QR-code for that record. The QR links to that that the record that itself and can be shared with the contact. We package a template flow (Default Reservation Email Alert template) which can be cloned to perform this action but you are free to share the QR code in another way.
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When this QR-code is scanned, it opens the Salesforce mobile app on the record page. On this page there are two buttons one to check in, and one to check out.
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The date and time for both actions will be stored on the record so you can report on the amount of check-ins and check-outs.
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