Telefoon SMS API

openapi: 3.0.3
info:
  title: Telefoon SMS API
  description: >-
    GDPR-compliant SMS API for European markets. Send A2P SMS with branded sender IDs,
    receive inbound messages, track delivery reports, and maintain GDPR audit logs.
  version: v1
  contact:
    name: Telefoon Support
    url: https://www.telefoon.com/support
  termsOfService: https://www.telefoon.com/terms
servers:
  - url: https://api.telefoon.com/v1/sms
    description: Telefoon SMS API (EU data center)
security:
  - ApiKeyAuth: []
tags:
  - name: Messages
    description: Send and receive SMS messages
paths:
  /messages:
    get:
      operationId: listMessages
      summary: List Messages
      description: List sent and received messages.
      tags:
        - Messages
      parameters:
        - name: direction
          in: query
          schema:
            type: string
            enum: [inbound, outbound]
        - name: status
          in: query
          schema:
            type: string
            enum: [queued, sending, sent, delivered, undelivered, failed, received]
        - name: page
          in: query
          schema:
            type: integer
        - name: page_size
          in: query
          schema:
            type: integer
            maximum: 100
      responses:
        '200':
          description: List of messages
          content:
            application/json:
              schema:
                type: object
                properties:
                  messages:
                    type: array
                    items:
                      $ref: '#/components/schemas/Message'
                  total:
                    type: integer
    post:
      operationId: sendMessage
      summary: Send Message
      description: Send an SMS message with optional branded sender ID.
      tags:
        - Messages
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
                - to
                - from
              properties:
                to:
                  type: string
                  description: Recipient phone number in E.164 format
                from:
                  type: string
                  description: Sender ID — phone number or alphanumeric sender name (max 11 chars)
                body:
                  type: string
                  description: Message text (max 160 chars per segment)
                sender_id:
                  type: string
                  description: Registered alphanumeric sender name (EU regulated markets)
                status_callback:
                  type: string
                  description: URL for delivery status webhooks
                gdpr_consent_ref:
                  type: string
                  description: Reference to consent record for GDPR compliance tracking
      responses:
        '201':
          description: Message sent
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Message'
  /messages/{message_id}:
    get:
      operationId: getMessage
      summary: Get Message
      description: Get details for a specific message.
      tags:
        - Messages
      parameters:
        - name: message_id
          in: path
          required: true
          schema:
            type: string
      responses:
        '200':
          description: Message details
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Message'
        '404':
          description: Not found
    delete:
      operationId: deleteMessage
      summary: Delete Message
      description: Delete a message record (GDPR right-to-erasure support).
      tags:
        - Messages
      parameters:
        - name: message_id
          in: path
          required: true
          schema:
            type: string
      responses:
        '204':
          description: Message deleted
components:
  securitySchemes:
    ApiKeyAuth:
      type: apiKey
      in: header
      name: X-API-Key
  schemas:
    Message:
      type: object
      required:
        - id
        - status
        - direction
        - from
        - to
      properties:
        id:
          type: string
          description: Unique message identifier
        status:
          type: string
          enum: [queued, sending, sent, delivered, undelivered, failed, received]
        direction:
          type: string
          enum: [inbound, outbound]
        from:
          type: string
          description: Sender number or alphanumeric ID
        to:
          type: string
          description: Recipient phone number
        body:
          type: string
          description: Message text
        num_segments:
          type: integer
          description: SMS segments used
        price:
          type: string
          description: Message cost
        price_unit:
          type: string
          description: Currency (default EUR)
        date_created:
          type: string
          format: date-time
        date_sent:
          type: string
          format: date-time
        error_code:
          type: integer
          description: Error code if failed
        error_message:
          type: string
          description: Error description