AT&T SMS API
A RESTful API enabling established businesses to broadcast SMS short code messages to AT&T subscribers in the United States. Supports sending to up to 50 recipients per call and up to 1 million messaging API calls monthly. Includes delivery status callbacks and GSMA OneAPI-compatible endpoints.
Documentation
Documentation
https://developer.att.com/sms/docs
APIReference
https://developer.att.com/sms/docs/v2
Authentication
https://developer.att.com/oauth-2/docs
GettingStarted
https://developer.att.com/sms
Specifications
OpenAPI
#SMS
#Messaging
#Short Code
#Notifications