I'm adding paid plans to my site but I need to collect additional info from users before they become members. I want to keep the entire process of the Paid Plans app, but want to add in a custom form in between selecting a plan and payment. I need additional info beyond their email and name. To clarify, I want to keep the entire sign up process of Paid Plans, I just want to add in an extra form. Is this possible to do in Corvid?