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And I would like add some custom paramter for the user logged (for exemple his customer id) on my web site, and I would like to see this paramters in console in backoffice. 

I see that, I can add a new field to ask to visitor to write, but my visitor don't know his customer ID.

And in my website, when I add the code of the widget, It's easy to add a custom paramter with the customer ID. 

It s'possible on SalesIQ  ?