Wix announced the full release of https://www.wix.com/velo/reference/wix-members & https://www.wix.com/velo/reference/wix-members-backend !
New APIs will be in these namespaces but Wix will continue to support the existing functions in wix-users and wix-users-backend, so your production sites won’t experience any breaking changes.
Wix Members API is made for future functionally expansion as well.