This article only applies to Brands with GDPR opt-in enabled.
If your Brand has GDPR opt-in enabled, your users are prompted to opt-in to promotional push notifications & e-mails.
If the user opts-in to promotional push notifications and/or e-mails, the Push/E-Mail Subscription Status for the user is changed to "Opted In".
To ensure that you are only sending to opted-in users when creating a Campaign or Canvas in Braze, use the Send to dropdown in Step 3 - Target Users and set it to "opted-in users only". That way, only users that have opted-in to your promotional messages will receive the notification / e-mail.