Access Roles, Checkout Process, Restrict Admin Navigation

Created Users_access_roles module
Created Users user_roles module
Check out check user login status
Redirect to billing info if logged in

Supplier and buyer Admin:

Restricted navigation per user role

Created Clients Billing info module
Save from checkout
Created client shipping info
Save from checkoout
Loaded Shipping and Payment Methods from DB
Pre Payment Summary
Cart View
Payment Methods