GTM and Piwik PRO anonymous tracking?

Hello Kuba,

We are using One Trust as our cookie CMP. We are still not ready to commit to use PPTM as our TMS, specially because of its lack of a feature where I can refer to other variables in HTML Tags and Custom Javascript Variables. This makes the switching setup harder.

Also regarding tracking, I am using HTML Tags instead of your GTM Template.
How could I use the tracking API? Thanks