Can I use 1 database for all sites? i.e. 1 user can login to all sites. How to do it? Thanks
While Members are stored in database collections, the Members and the CMS module of Wix do not behave the same way.
It is possible to share a CMS collection, you can set it up on one site and expose it as an API for the other sites to use
As for Member login, however, I do not think that can be done, as Wix’s internal system requires a Member record to be generated