As the title says
Thanks – I simply want to pre-populate some field data for tracking purposes
You can pass URL variables into a survey on any plan, per:
The determining factor will probably be what you are hoping to do with those variables – if you are simply needing to capture them, any plan should be fine.
But if you need to use the variables in logic conditions or something more advanced, you will likely need a higher plan level.
Hope this helps!