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AT&T In-App Messaging

ATT in-app messaging API allows you to send, receive, update, and delete MMS and SMS messages on behalf of a specific user after confirming the user's explicit consent. You can send messages to phone numbers (AT&T and cross-carrier), short codes or email addresses. You can also allow your server to receive automatic notifications when clients receive messages via the Webhooks Notification API.
AT&T In-App Messaging Screenshot

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