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Thanks for posting your inquiry.
By passing parameters, did you mean by auto fill the fields using data submitted from another form? If so, yes it can be done. Please refer to this user guide on How to Prepopulate Form Fields via URL Parameters.
You may also use our Field Prepopulator Application from our Apps Gallery to help you out to generate the URL parameters that you can use on your first form via Thank You Custom URL.
Please let us know if you need further assistance or you may open a new thread if it is unrelated inquiry. Thank you
Perfect, thank you that worked!
Now, can I also access some of the form parameters to return them to a custom URL on the thank you page?
It is great that you have managed to make it work. Feel free to post any inquiries on the forum again on anytime you wish by creating a new thread.