When a customer clicks a support link with their account ID in it, or someone follows a campaign link to a signup form, that context shouldn't get lost the moment the form loads — and the person shouldn't have to type it back in themselves.

URL Parameters let a form capture values straight from the link that opened it: a referral source, a customer ID, a ticket number, whatever context your link already carries. Declare a parameter once in Form Settings, and MergePoint reads it from the query string automatically the instant the form loads — no extra field, no manual entry.

That captured value can personalize the form itself (e.g. "Welcome back, {{param:customer_name|there}}") and it's carried forward automatically if the form is shared onward mid-flow, so attribution and context survive across steps instead of disappearing after the first click.