With this plugin, you can generate a QR-Code and give bonus the user after scanning the barcode several times.
For example, you show a QR-Code to the user after the sale of each cafe or food. The user scans the QR-Code and after 9 or 12 times gets a free bonus.
This plugin does not require registration for users and works based on cookies. (It is easy for the user)
You can download this project as a zip file and upload it manually in the WordPress plugins section. Or installation direct from Wordpress: