Need Wallet feature for my website

I’m running a website that sells Social media services to all buyers [not just registered]. Currently, Im using Gravity forms plugin which is the best I have ever used. Payment option is paypal as of now. Woo-commerce might be good but I felt gravity forms suits my needs to the core. Now, Im looking for a feature which allows buyer to sign in and deposit a minimum amount which they can use for later purchases. I couldn’t find any add on for gravity forms.

Found some standalone plugins like WP deposit, Easy Downloads … None suits me. I want a clean, simple form like the one I have with a deposit feature. Please help me guys I need it badly.

This is my website: https://neopanel.net