1. One identifier, carried on the link
Each queued message already has an identifier. Appending it to the links inside that message is enough to connect a click back to its source without tracking pixels or third party scripts.
2. Remember it for the visit, not forever
A person often clicks the link, reads for a while, and converts two pages later. Holding the identifier for the session bridges that gap. Holding it beyond the session would over-credit the message and under-credit everything else.
3. Group by cohort, not by individual
The useful report is one row per demographic and message: how many were sent, how many next steps followed, and which call to action they chose. Individual level scoring adds little and invites misuse.
4. Read the report as a pruning tool
Most sequences carry one or two messages doing the work and several filling space. Retiring the quiet ones shortens the sequence, respects the reader, and usually raises the conversion rate of what remains.
5. Change the schedule, not the code
Once you can see which touch works, you need to be able to move it. Delays, touch counts, and per demographic timing belong in a settings table an administrator can edit, not in a deployment.