True passwordless login

I’m currently exploring Memberstack as a way to combine my Firebase Auth + Circle.so memberships for wellpaid.io.

I’ve hit a wall - passwordless login. I don’t want users to have to reset their passwords on migration, and the passwordless signup workaround isn’t really going to work for me since it doesn’t have a passwordless login feature, and isn’t particularly secure.

Is there any way to do true passwordless signup and login, with secure, temporary login tokens?