Complete Wix Store App

I need a professional to finalize my Wix store app within the next week.

Key Tasks:
- Design and layout adjustments on the homepage and product pages.
- Fix backend functionalities, including payment gateway integration and user account management.
- Content updates across the site.

Ideal Skills:
- Proven experience with Wix
- Strong design skills
- Expertise in backend functionalities, especially payment gateways and user accounts
- Ability to meet tight deadlines

Please provide a portfolio of similar work.