How to tag a QR code?

There are two steps to doing this:

  1. Declare a marketing custom source for QR codes and apply a campaign to each QR code.

    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 format should resemble the following: 
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