openapi: 3.1.0
info:
  title: Azure Communication Services REST Email SMS API
  description: Azure Communication Services REST APIs provide messaging, telephony, identity, chat, and email capabilities. Authentication uses HMAC SHA256 or Azure AD tokens.
  version: '2024-08-01'
servers:
- url: https://{resource}.communication.azure.com
  variables:
    resource:
      default: myresource
security:
- hmac: []
tags:
- name: SMS
paths:
  /sms:
    post:
      operationId: sendSms
      summary: ACS Send SMS
      description: Sends one or more SMS messages.
      tags:
      - SMS
      parameters:
      - name: api-version
        in: query
        required: true
        schema:
          type: string
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                from:
                  type: string
                smsRecipients:
                  type: array
                  items:
                    type: object
                message:
                  type: string
      responses:
        '202':
          description: Send accepted
          content:
            application/json:
              schema:
                type: object
components:
  securitySchemes:
    hmac:
      type: apiKey
      in: header
      name: Authorization
      description: HMAC-SHA256 signed Authorization header
externalDocs:
  description: Azure Communication Services REST API Documentation
  url: https://learn.microsoft.com/en-us/rest/api/communication/
x-generated-from: https://learn.microsoft.com/en-us/rest/api/communication/
x-generated-by: claude-crawl-2026-05-08