openapi: 3.0.3
info:
  title: ClickSend v3 Account SMS API
  description: Representative OpenAPI 3.x description of the ClickSend v3 REST API, a single cloud communications API for SMS, MMS, voice / text-to-speech, transactional email, and physical post (letters and postcards), plus contacts and lists, delivery receipts, inbound handling, and account/balance. All requests use HTTP Basic authentication with your ClickSend username and API key. This document models a representative subset of the documented endpoints; see the official reference for the complete surface.
  termsOfService: https://www.clicksend.com/au/legal/terms-of-service/
  contact:
    name: ClickSend Support
    email: support@clicksend.com
    url: https://developers.clicksend.com/
  version: '3.1'
servers:
- url: https://rest.clicksend.com/v3
  description: ClickSend v3 production API
security:
- basicAuth: []
tags:
- name: SMS
  description: Send and view SMS messages.
paths:
  /sms/send:
    post:
      tags:
      - SMS
      operationId: smsSendPost
      summary: Send one or more SMS messages.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/SmsMessageCollection'
      responses:
        '200':
          description: Messages queued.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiResponse'
  /sms/price:
    post:
      tags:
      - SMS
      operationId: smsPricePost
      summary: Calculate the total price for one or more SMS messages before sending.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/SmsMessageCollection'
      responses:
        '200':
          description: Price calculated.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiResponse'
  /sms/history:
    get:
      tags:
      - SMS
      operationId: smsHistoryGet
      summary: Get a paginated list of sent SMS messages.
      parameters:
      - $ref: '#/components/parameters/page'
      - $ref: '#/components/parameters/limit'
      responses:
        '200':
          description: A paginated list of SMS messages.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiResponse'
  /sms/{message_id}/cancel:
    put:
      tags:
      - SMS
      operationId: smsCancelPut
      summary: Cancel a queued SMS message that has not yet been sent.
      parameters:
      - name: message_id
        in: path
        required: true
        schema:
          type: string
      responses:
        '200':
          description: Message cancelled.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiResponse'
  /sms/templates:
    get:
      tags:
      - SMS
      operationId: smsTemplatesGet
      summary: Get a list of saved SMS templates.
      responses:
        '200':
          description: A list of SMS templates.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiResponse'
components:
  parameters:
    page:
      name: page
      in: query
      required: false
      schema:
        type: integer
        default: 1
      description: Page number for paginated results.
    limit:
      name: limit
      in: query
      required: false
      schema:
        type: integer
        default: 10
      description: Number of results per page.
  schemas:
    SmsMessage:
      type: object
      properties:
        source:
          type: string
          description: Source of the message (e.g., php, sdk).
          default: sdk
        from:
          type: string
          description: Sender ID or dedicated number.
        body:
          type: string
          description: Message body.
        to:
          type: string
          description: Recipient number in E.164 format.
        schedule:
          type: integer
          description: Unix timestamp to schedule delivery.
        custom_string:
          type: string
        country:
          type: string
        list_id:
          type: integer
      required:
      - body
      - to
    ApiResponse:
      type: object
      properties:
        http_code:
          type: integer
          example: 200
        response_code:
          type: string
          example: SUCCESS
        response_msg:
          type: string
        data:
          type: object
    SmsMessageCollection:
      type: object
      properties:
        messages:
          type: array
          items:
            $ref: '#/components/schemas/SmsMessage'
      required:
      - messages
  securitySchemes:
    basicAuth:
      type: http
      scheme: basic
      description: HTTP Basic authentication using your ClickSend username and API key. The username is your ClickSend account username; the password is your API key from the ClickSend dashboard.