First of all congratulate the creators of piwik for this great tool.
I’m using piwik recently and I’m checking its many options.
I send emalings with links to my website. In step one parameter url the user identifier.
As I can associate this id with the id of the visit.
My idea is to recognize visitors in future hearings. As I can do ??
Use SetUserID() on the first visit by emailing.
On subsequent visits I UserdId be automatically recognized? Or I have to store it in a cookie and call SetUserID() on each visit?
It would be better to use custom variables rather than UserID.
Thank you very much and best regards !!