WHAT DOES QR CODES THAT DON'T EXPIRE MEAN?

the info pixels with a QR code are clustered in little patterns, which converse additional information than easy black and white dots. A QR (brief Response) code is actually a kind of barcode. It holds info that could be read by a QR code scanner, generally a smartphone camera or app, and might be shared online or printed. [seventy three] If QR c