openapi: 3.0.3
info:
  title: Kaleyra CPaaS Messages API
  description: Kaleyra (a Tata Communications company) omnichannel CPaaS REST API for SMS, WhatsApp, RCS, Voice, and Verify (OTP), plus the Kaleyra Video REST API. Requests authenticate with the `api-key` header and address an account by its SID in the URL path. Regional hosts serve India, APAC/SEA, and EU data residency.
  termsOfService: https://www.kaleyra.com/terms-conditions/
  contact:
    name: Kaleyra Support
    url: https://support.kaleyra.com/
  version: '2.0'
servers:
- url: https://api.kaleyra.io
  description: Default / global host
- url: https://api.in.kaleyra.io
  description: India region (data residency)
- url: https://api.ap.kaleyra.io
  description: APAC / South East Asia region
- url: https://api.eu.kaleyra.io
  description: Europe region
security:
- apiKeyAuth: []
tags:
- name: Messages
  description: Send SMS, WhatsApp, and RCS messages and read their status.
paths:
  /v2/{sid}/messages:
    post:
      operationId: sendMessage
      tags:
      - Messages
      summary: Send an SMS, WhatsApp, or RCS message
      description: Sends an outbound message on the selected channel. Use the `channel` field to select `sms`, `whatsapp`, or `rcs`. For SMS, `type` selects MKT (marketing), TXN (transactional), or OTP. Multiple recipients are comma-separated in `to`.
      parameters:
      - $ref: '#/components/parameters/Sid'
      requestBody:
        required: true
        content:
          application/x-www-form-urlencoded:
            schema:
              $ref: '#/components/schemas/SendMessageRequest'
          application/json:
            schema:
              $ref: '#/components/schemas/SendMessageRequest'
      responses:
        '200':
          description: Message accepted for delivery.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MessageResponse'
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
    get:
      operationId: listMessages
      tags:
      - Messages
      summary: Get message logs / delivery status
      description: Retrieves message logs and delivery status for the account.
      parameters:
      - $ref: '#/components/parameters/Sid'
      - name: type
        in: query
        required: false
        schema:
          type: string
          enum:
          - MKT
          - TXN
          - OTP
      - name: from_date
        in: query
        required: false
        schema:
          type: string
      - name: to_date
        in: query
        required: false
        schema:
          type: string
      responses:
        '200':
          description: A list of messages with delivery status.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MessageLogResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /v2/{sid}/messages/{message_id}:
    get:
      operationId: getMessageStatus
      tags:
      - Messages
      summary: Get the delivery status of a single message
      parameters:
      - $ref: '#/components/parameters/Sid'
      - name: message_id
        in: path
        required: true
        schema:
          type: string
      responses:
        '200':
          description: Status of the requested message.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MessageResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
components:
  schemas:
    Error:
      type: object
      properties:
        error:
          type: string
        message:
          type: string
    MessageLogResponse:
      type: object
      properties:
        data:
          type: array
          items:
            $ref: '#/components/schemas/MessageResponse'
    MessageResponse:
      type: object
      properties:
        id:
          type: string
        status:
          type: string
        channel:
          type: string
        recipient:
          type: string
    SendMessageRequest:
      type: object
      required:
      - to
      - sender
      properties:
        to:
          type: string
          description: Recipient MSISDN(s), comma-separated for multiple numbers.
          example: 919XXXXXXXXX
        sender:
          type: string
          description: Registered sender ID.
        body:
          type: string
          description: Message text (SMS/RCS) or template body.
        channel:
          type: string
          enum:
          - sms
          - whatsapp
          - rcs
          default: sms
        type:
          type: string
          enum:
          - MKT
          - TXN
          - OTP
          description: SMS category (India DLT-aware).
        template_id:
          type: string
          description: Approved template ID (required for some channels/regions).
        callback_url:
          type: string
          format: uri
  parameters:
    Sid:
      name: sid
      in: path
      required: true
      description: Account SID (Security Identifier) issued by kaleyra.io.
      schema:
        type: string
  responses:
    Unauthorized:
      description: Missing or invalid api-key header.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    BadRequest:
      description: The request was malformed or missing required fields.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  securitySchemes:
    apiKeyAuth:
      type: apiKey
      in: header
      name: api-key
      description: API key generated in the kaleyra.io console (e.g. "Ac4XXXXX21f").