Hey @Wojtek! What you’re describing is entirely possible. The tricky part is in the fact that you need to:
- first collect the information about which visitors performed given conversion
- secondly fetch the data for those visitors for those 90 days back
I created a guide on how to fetch raw data from Piwik PRO into Google Spreadsheet:
If you want to play around with API calls you can do it with another tool I created for this → https://logbaker.com/
Also feel free to reach out to me via DM here or my socials, we can figure this out together. For example a Python script could do both of those things in one run and output a ready to go Excel file 