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Hey Mark, Seems like the best way to handle this type of issue is to use a dynamically assigned hidden form value and use a query string to assign the value. You may already be doing this, but if not here's Squarespace's support document for this. As Martijn stated, to maintain this value across multiple page views you will need to implement a session variable or cookie. This can be a time consuming effort and possibly one that may be best ignored for the time being, but if you're looking for more accurate tracking will be your best bet. I reviewed squarespace's support documentation and there does not appear to be a way to natively do this, so speaking with the client's development team is likely best. Let us know if we can be of any further assistance on this! Regards, Trenton