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Hi @jimk1416,
We already have an invite code feature available in the premium version. For more details, please check this link https://wpuserregistration.com/features/invite-codes.
According to the WordPress Support community guidelines, we can not discuss the premium features here because this support forum is for free plugin users.
If you are interested in premium features, please go through this link . You will find the live chat option to contact our support representative.
Regards!