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Thanks Brendan, understood, and since you are the moderator(?) it goes to the right person - thank you!
Please see these threads for more on this topic:
https://community.playfab.com/questions/14979/key-system-to-verify-players.html
https://community.playfab.com/questions/8089/useraccount-registration-outside-of-client-api-cal.html
In short, you'll need to have some form of "entitlement" check that you use to gate gameplay.
Thanks Brendan,
Can I do this at the point of account registration by a new user? i.e. to prevent people who are not on our 'whitelist of emails' from opening an account in the first place?
No, what you would do is have an "entitlement" that you check, which enables gameplay. It would not prevent a client from calling the Login... API call that you use for your title. We'll be providing a way to create "Activation Codes" for games which games will be able to use to fully block account creation (for players who don't have one) in a future update, but we do not have a date for that as of yet.
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