Q: If a client already has existing users and subscriptions, what happens if they decide to implement DOI (Double-Opt-In)?
A: Only new users and registrations will be affected after a client (support) enables DOI for an already active application.
Q: To what type of registration does DOI apply?
A: DOI applies to any kind of registration. It can be a simple account creation only, but also when a user purchases a subscription or gets access to a registration term.