For example, one form is intended to allow people to register for a mutiday event with several different options for sessions and meals each day. The nintex cloud form works great for capturing this information and saving it to the appropriate Sharepoint Lists. However, the second stage of this registration is actually paying for it. We're trying to find a way to allow the user to fill out the first form, then seamlessly transition to our payment system which can accept POST data including name, line items, prices, and other fields.
Does this answer your question?
In Nintex Forms for Nintex Workflow Cloud, we can pass the user to a static address, but we wont be able to pass them to a dynamic address with query string parameters at this time.
You can still use Old Responsive in Office365 which includes a button property of 'Redirect URL'. This would allow you to pass parameters in the query string.
We have this in the backlog for New Responsive, but I dont have a timeframe for this as yet.
And are these Old Responsive Office 365 buttons with redirect URLs available in forms that can be used by unauthenticated guests? We are collecting registrations from the public, not just organization members.