QR code for Viber
Useful when Viber is the main support or sales channel and the scan should jump into a chat.
If your audience already talks to you in Viber, a dedicated QR removes extra steps. The user scans the code and gets a direct chat entry for the number you specify.
This page uses a viber://chat?number= link. That means real device testing matters, especially before print.
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Recommended: M. Higher level = more reliable when damaged