How to tag a QR code?

1) Declare a marketing custom source for QR Codes and apply a campaign to each QR Code for instance.

Tools > Sources and campaigns > Marketing campaigns > Custom > Sources: add a new Source​​ for which you can add as many variables as needed. Please note that only variable C is required to declare the source. Here the source can be named QR Codes. 

2) Tag the link in the QR Code.

​The direct method should be like: 

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