Custom Forms: Pay per form submission & Client Portal

Hi Webflow Community,

I am new to webflow, and already it has nearly everything I dreamt of having for my site. However, I have been scouring the internet and forums for a efficient and feasible (I have no knowledge of coding) to create 1) A Client Portal (although I understand Firebase is okay for this?) and 2) A form submission application that forces payment before submission (and deducts from a bundle submission pack of say 10 each time a client submits their data through a form, and forces renew of the bundle package when the pack runs dry).

I understand this will take extensive coding, but could anyone direct me to the best way to go about this? Currently we are testing a version using Zoho’s Creator App deployed to SquareSpace. But for aesthetic reasons, we cannot stick with this current arrangement. Webflow looks a billion times better!

Any help in advance would be greatly appreciated!