A unique scan counts as the first time a QR code was scanned in one day. For example, if a user scans a QR code at 9 AM, it counts as a unique scan. If the same user scans the same QR code at 12 AM the next day, it counts as another unique scan.
A scan includes a sequence of visits to the content of the QR code after a unique scan in one day. A unique scan already contains a scan. For example, if a user scans a QR code at 9 AM and scans it again at 1 PM, it counts as one unique scan and two scans.