Every visitor to a shop, restaurant, sports field, event or the like has to register today and sometimes enter it several times a day in various visitor / registration lists. The app is easy to use. The registration for the visitors takes place without an installation via an easy to use web form. The visitor scans the QR code and records their personal data once in the mobile phone. Once the data has been recorded, it can be used for checking in and out in all institutions, facilities and restaurants that support TyG.