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AT&T In-App Messaging API - Developers

The 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 explicit user consent. You can send messages to phone number's (AT&T and cross-carrier), short codes, or e-mail addresses. Other choices include having your server receive push notifications when customers receive messages via the Webhooks Notification API.