Hey Bart,
Thanks for reaching out!
While there is no “Guest List” feature like you asked about, unfortunately, there are indeed QR Code scanning apps out there that are used for scanning QR Codes on tickets. Our plugins do NOT do the scanning themselves; they simply make the tickets with the QR Codes that can then be scanned by other apps.
For iOS and Android alone there are hundreds of free QR Code apps out there, maybe more.
I hope this information helps!
George