Wix Velo Payment & Login Integration

We are looking for an experienced Wix developer to help implement advanced functionality on our website.

Scope of work:
Integrate secure payment gateway into Wix website
Develop custom login/signup functionality using Velo (Wix Code)
Connect user data with database collections
Implement role-based access or user-specific features
Ensure responsive design and smooth user experience
Fix existing bugs and optimize performance if required

Requirements:
Strong experience with Wix Velo (Wix Code)
JavaScript and frontend development experience
Experience with payment gateway integration (Stripe/Razorpay/ etc.)
Knowledge of Wix database collections and permissions

Please share:
Relevant Wix projects
Estimated timeline
Cost estimate