When building a Kizen form, you have the option to build the Thank You Page, or go to an outside URL upon submission. If you've chosen to redirect your contacts to a URL, you can pass the variables on the re-direct.
To do so, check the box next to Pass variables on redirect on your Form's Settings page.
Once this option is clicked, the parameters will get set automatically and passed through like so:
All fields on your form will get passed through, which will allow for pre-filling smart forms where parameters match.
As an example, once someone fills out our interest form, we send them to our scheduler page on Calendly.com. We want those fields to be pre-populated.
When passing variables, the Calendly form will automatically do so as displayed below: