Add the QR Code Reader to Control Center for quick access when you need to scan a QR code. In iOS 13 and iPadOS, it works faster than ever and has a flashlight feature too.
To learn more about this topic visit the following articles:
Scan a QR code with your iPhone, iPad, or iPod touch: https://apple.co/2NAZ0Br
Use and customize Control Center on your iPhone, iPad, and iPod touch: https://apple.co/2r5vCLV
Open your Camera app
https://apple.co/327gACb
Additional Resources:
Contact Apple Support for iPhone: http://apple.co/iPhone
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To download the Apple Support app: http://apple.co/2hFtzIv
Apple Support on Twitter: https://twitter.com/AppleSupport
For more videos, go to Youtube Apple Channel