How to redirect users to next form with submission data prepopulated?

We have several conferences where attendees need to be approved. My question is, once they are approved, how can I have them register with payment via credit card? Do I need to redirect them and they have to register again. Is there a simple way of approving and asking them to register with credit card without having to re-register?

We have an option to redirect users to next form automatically: Redirecting-Users-to-a-Different-Page

If you create a population link, submitted information can be also passed to second form and users will not need to re-enter it: How-to-Automatically-Pass-Form-Data-to-Another-Form

For your case, I see it like this. A user submits your first form, you approve the application and form sends an email with populated link of second form to the user. Would this work for you?

Here is one more help article: How-to-Send-Email-Based-on-User-s-Answer

Thank you
R
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