Need a Corvid/Wix expert

I need someone who can give me some consultation on help I need for my Wix website/Corvid.

i have a live website created in wix that is setup for users to purchase paid plans. The plans will give them access to a software my developers have created. I need someone to advise on how we can link the 2 sites so when a user purchases a plan in Wix, they can then sign up and go to the login page. When they login, they need to be able to access the software my developers have created that is currently created in a different system.

Looking to pay someone an hour to consult with the development team on how to do this or advise a way around it.