You can easily scan QR codes that are already on your phone

Android and iOS both have built-in tools to easily open QR codes from screenshots.
Cult of Mac

iOS 14 could allow Apple Pay users to pay up by scanning QR codes or barcodes

iOS 14 will allow users to make payments using QR codes with Apple Pay, a hidden feature in the Wallet app discovered by 9to5Mac suggests. While the feature isn’t functional yet, it will allow users ...