AT&T · Authentication Profile

At And T Authentication

Authentication

AT&T secures its APIs with apiKey and oauth2 across 3 declared security schemes, as derived from its OpenAPI definitions. OAuth 2.0 is offered via the authorizationCode and clientCredentials flow(s).

Fortune 100TelecommunicationsWirelessWirelineMessagingSpeechMobileBroadbandEnterprise
Methods: apiKey, oauth2 Schemes: 3 OAuth flows: authorizationCode, clientCredentials API key in: header

Security Schemes

oauth2 oauth2
· flows: authorizationCode
clientId apiKey
· in: header (X-Client-Id)
oauth2 oauth2
· flows: clientCredentials

Source

Authentication Profile

Raw ↑ 
generated: '2026-07-11'
method: derived
source: openapi/at-and-t-in-app-messaging-api.yaml, openapi/at-and-t-mvnx-api.yaml, openapi/at-and-t-sms-api.yaml
summary:
  types:
  - apiKey
  - oauth2
  api_key_in:
  - header
  oauth2_flows:
  - authorizationCode
  - clientCredentials
schemes:
- name: oauth2
  type: oauth2
  flows:
  - flow: authorizationCode
    authorizationUrl: https://api.att.com/oauth/v4/authorize
    tokenUrl: https://api.att.com/oauth/v4/token
    scopes: 2
  description: AT&T OAuth 2.0 with user consent via authorization code flow
  sources:
  - openapi/at-and-t-in-app-messaging-api.yaml
- name: clientId
  type: apiKey
  in: header
  parameter: X-Client-Id
  description: Client ID enforcement policy for MVNX API authentication
  sources:
  - openapi/at-and-t-mvnx-api.yaml
- name: oauth2
  type: oauth2
  flows:
  - flow: clientCredentials
    tokenUrl: https://api.att.com/oauth/v4/token
    scopes: 6
  description: AT&T OAuth 2.0 authentication using client credentials grant
  sources:
  - openapi/at-and-t-sms-api.yaml