App for a college professor to track student presence in the course

I have an idea for an application used by a university professor to track students' attendance in a course. The application will use a QR code scanner to track students who attend classes.<br><br><br>The idea is to generate an individual QR code for each course and for each professor. The students will have to scan the QR code at the beginning of the course to mark their presence with the time and date they scanned the QR code.<br><br><br>This is a simple description of the application, but I would like to know your developing suggestions in the comments!<br><br><br>Thank you!