ClickSend Transactional Email API

openapi: 3.0.3
info:
  title: ClickSend v3 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.
  - name: MMS
    description: Send and view MMS messages.
  - name: Voice
    description: Send and view voice (text-to-speech) messages.
  - name: Email
    description: Send and view transactional email.
  - name: Post Letter
    description: Print and mail physical letters.
  - name: Post Postcard
    description: Print and mail physical postcards.
  - name: Contact
    description: Manage contacts.
  - name: ContactList
    description: Manage contact lists.
  - name: Receipts
    description: Delivery receipts, inbound messages, and automations.
  - name: Account
    description: Account details, usage, and balance.
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'
  /mms/send:
    post:
      tags:
        - MMS
      operationId: mmsSendPost
      summary: Send one or more MMS messages with a media file and subject.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/MmsMessageCollection'
      responses:
        '200':
          description: MMS queued.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiResponse'
  /mms/price:
    post:
      tags:
        - MMS
      operationId: mmsPricePost
      summary: Calculate the total price for one or more MMS messages before sending.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/MmsMessageCollection'
      responses:
        '200':
          description: Price calculated.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiResponse'
  /mms/history:
    get:
      tags:
        - MMS
      operationId: mmsHistoryGet
      summary: Get a paginated list of sent MMS messages.
      parameters:
        - $ref: '#/components/parameters/page'
        - $ref: '#/components/parameters/limit'
      responses:
        '200':
          description: A paginated list of MMS messages.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiResponse'
  /voice/send:
    post:
      tags:
        - Voice
      operationId: voiceSendPost
      summary: Send one or more voice (text-to-speech) messages.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/VoiceMessageCollection'
      responses:
        '200':
          description: Voice messages queued.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiResponse'
  /voice/price:
    post:
      tags:
        - Voice
      operationId: voicePricePost
      summary: Calculate the total price for one or more voice messages before sending.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/VoiceMessageCollection'
      responses:
        '200':
          description: Price calculated.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiResponse'
  /voice/lang:
    get:
      tags:
        - Voice
      operationId: voiceLangGet
      summary: Get a list of supported voice languages and voices.
      responses:
        '200':
          description: A list of supported languages.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiResponse'
  /voice/{message_id}/cancel:
    put:
      tags:
        - Voice
      operationId: voiceCancelPut
      summary: Cancel a queued voice message.
      parameters:
        - name: message_id
          in: path
          required: true
          schema:
            type: string
      responses:
        '200':
          description: Voice message cancelled.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiResponse'
  /email/send:
    post:
      tags:
        - Email
      operationId: emailSendPost
      summary: Send a transactional email from a verified sender address.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/Email'
      responses:
        '200':
          description: Email queued.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiResponse'
  /email/price:
    post:
      tags:
        - Email
      operationId: emailPricePost
      summary: Calculate the price of an email before sending.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/Email'
      responses:
        '200':
          description: Price calculated.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiResponse'
  /email/history:
    get:
      tags:
        - Email
      operationId: emailHistoryGet
      summary: Get a paginated list of sent emails.
      parameters:
        - $ref: '#/components/parameters/page'
        - $ref: '#/components/parameters/limit'
      responses:
        '200':
          description: A paginated list of emails.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiResponse'
  /email/addresses:
    get:
      tags:
        - Email
      operationId: emailAddressesGet
      summary: Get a list of verified email from-addresses.
      responses:
        '200':
          description: A list of verified email addresses.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiResponse'
  /post/letters/send:
    post:
      tags:
        - Post Letter
      operationId: postLettersSendPost
      summary: Print and mail one or more letters from an uploaded PDF.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/PostLetter'
      responses:
        '200':
          description: Letters queued for print and mail.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiResponse'
  /post/letters/price:
    post:
      tags:
        - Post Letter
      operationId: postLettersPricePost
      summary: Calculate the price of a letter before sending.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/PostLetter'
      responses:
        '200':
          description: Price calculated.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiResponse'
  /post/letters/history:
    get:
      tags:
        - Post Letter
      operationId: postLettersHistoryGet
      summary: Get a paginated list of sent letters.
      parameters:
        - $ref: '#/components/parameters/page'
        - $ref: '#/components/parameters/limit'
      responses:
        '200':
          description: A paginated list of letters.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiResponse'
  /post/letters/detect-address:
    post:
      tags:
        - Post Letter
      operationId: postLettersDetectAddressPost
      summary: Detect and validate a delivery address on an uploaded letter PDF.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                file_url:
                  type: string
      responses:
        '200':
          description: Address detection result.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiResponse'
  /post/postcards/send:
    post:
      tags:
        - Post Postcard
      operationId: postPostcardsSendPost
      summary: Print and mail one or more postcards from an uploaded PDF.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/PostPostcard'
      responses:
        '200':
          description: Postcards queued for print and mail.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiResponse'
  /post/postcards/price:
    post:
      tags:
        - Post Postcard
      operationId: postPostcardsPricePost
      summary: Calculate the price of a postcard before sending.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/PostPostcard'
      responses:
        '200':
          description: Price calculated.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiResponse'
  /post/postcards/history:
    get:
      tags:
        - Post Postcard
      operationId: postPostcardsHistoryGet
      summary: Get a paginated list of sent postcards.
      parameters:
        - $ref: '#/components/parameters/page'
        - $ref: '#/components/parameters/limit'
      responses:
        '200':
          description: A paginated list of postcards.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiResponse'
  /uploads:
    post:
      tags:
        - Post Letter
      operationId: uploadsPost
      summary: Upload a media file (PDF, image) to reference in post, MMS, or campaigns.
      parameters:
        - name: convert
          in: query
          required: true
          schema:
            type: string
            enum: [mms, post, campaign]
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/Upload'
      responses:
        '200':
          description: File uploaded; returns a referenceable URL.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiResponse'
  /lists:
    get:
      tags:
        - ContactList
      operationId: listsGet
      summary: Get a paginated list of contact lists.
      parameters:
        - $ref: '#/components/parameters/page'
        - $ref: '#/components/parameters/limit'
      responses:
        '200':
          description: A paginated list of contact lists.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiResponse'
    post:
      tags:
        - ContactList
      operationId: listsPost
      summary: Create a new contact list.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/ContactList'
      responses:
        '200':
          description: Contact list created.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiResponse'
  /lists/{list_id}/contacts:
    get:
      tags:
        - Contact
      operationId: listContactsGet
      summary: Get a paginated list of contacts within a list.
      parameters:
        - name: list_id
          in: path
          required: true
          schema:
            type: integer
        - $ref: '#/components/parameters/page'
        - $ref: '#/components/parameters/limit'
      responses:
        '200':
          description: A paginated list of contacts.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiResponse'
    post:
      tags:
        - Contact
      operationId: listContactsPost
      summary: Create a new contact within a list.
      parameters:
        - name: list_id
          in: path
          required: true
          schema:
            type: integer
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/Contact'
      responses:
        '200':
          description: Contact created.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiResponse'
  /lists/{list_id}/import:
    post:
      tags:
        - ContactList
      operationId: listImportPost
      summary: Import contacts into a list from an uploaded file.
      parameters:
        - name: list_id
          in: path
          required: true
          schema:
            type: integer
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                file_url:
                  type: string
                field_order:
                  type: array
                  items:
                    type: string
      responses:
        '200':
          description: Contacts imported.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiResponse'
  /search/contacts-lists:
    get:
      tags:
        - ContactList
      operationId: searchContactsLists
      summary: Search across contacts and lists.
      parameters:
        - name: q
          in: query
          required: true
          schema:
            type: string
        - $ref: '#/components/parameters/page'
        - $ref: '#/components/parameters/limit'
      responses:
        '200':
          description: Search results.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiResponse'
  /sms/receipts:
    get:
      tags:
        - Receipts
      operationId: smsReceiptsGet
      summary: Get a paginated list of SMS delivery receipts.
      parameters:
        - $ref: '#/components/parameters/page'
        - $ref: '#/components/parameters/limit'
      responses:
        '200':
          description: A paginated list of delivery receipts.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiResponse'
  /sms/receipts-read:
    put:
      tags:
        - Receipts
      operationId: smsReceiptsReadPut
      summary: Mark SMS delivery receipts as read.
      requestBody:
        required: false
        content:
          application/json:
            schema:
              type: object
              properties:
                date_before:
                  type: integer
      responses:
        '200':
          description: Receipts marked as read.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiResponse'
  /sms/inbound:
    get:
      tags:
        - Receipts
      operationId: smsInboundGet
      summary: Get a paginated list of inbound SMS messages.
      parameters:
        - $ref: '#/components/parameters/page'
        - $ref: '#/components/parameters/limit'
      responses:
        '200':
          description: A paginated list of inbound SMS.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiResponse'
  /voice/receipts:
    get:
      tags:
        - Receipts
      operationId: voiceReceiptsGet
      summary: Get a paginated list of voice delivery receipts.
      parameters:
        - $ref: '#/components/parameters/page'
        - $ref: '#/components/parameters/limit'
      responses:
        '200':
          description: A paginated list of voice receipts.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiResponse'
  /mms/receipts:
    get:
      tags:
        - Receipts
      operationId: mmsReceiptsGet
      summary: Get a paginated list of MMS delivery receipts.
      parameters:
        - $ref: '#/components/parameters/page'
        - $ref: '#/components/parameters/limit'
      responses:
        '200':
          description: A paginated list of MMS receipts.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiResponse'
  /automations/sms/receipts:
    get:
      tags:
        - Receipts
      operationId: automationsSmsReceiptsGet
      summary: Get the configured SMS delivery-receipt automation (webhook) rules.
      responses:
        '200':
          description: A list of receipt automation rules.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiResponse'
    post:
      tags:
        - Receipts
      operationId: automationsSmsReceiptsPost
      summary: Create an SMS delivery-receipt automation that forwards receipts to a webhook URL.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/AutomationRule'
      responses:
        '200':
          description: Automation rule created.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiResponse'
  /automations/sms/inbound:
    get:
      tags:
        - Receipts
      operationId: automationsSmsInboundGet
      summary: Get the configured inbound-SMS automation (webhook) rules.
      responses:
        '200':
          description: A list of inbound automation rules.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiResponse'
    post:
      tags:
        - Receipts
      operationId: automationsSmsInboundPost
      summary: Create an inbound-SMS automation that forwards inbound messages to a webhook URL.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/AutomationRule'
      responses:
        '200':
          description: Automation rule created.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiResponse'
  /account:
    get:
      tags:
        - Account
      operationId: accountGet
      summary: Get account details, including the current credit balance.
      responses:
        '200':
          description: Account details.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiResponse'
  /account/usage/{year}/{month}/subaccount:
    get:
      tags:
        - Account
      operationId: accountUsageBySubaccountGet
      summary: Get account usage broken down by subaccount for a given month.
      parameters:
        - name: year
          in: path
          required: true
          schema:
            type: integer
        - name: month
          in: path
          required: true
          schema:
            type: integer
      responses:
        '200':
          description: Usage by subaccount.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiResponse'
  /subaccounts:
    get:
      tags:
        - Account
      operationId: subaccountsGet
      summary: Get a paginated list of subaccounts.
      parameters:
        - $ref: '#/components/parameters/page'
        - $ref: '#/components/parameters/limit'
      responses:
        '200':
          description: A paginated list of subaccounts.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiResponse'
components:
  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.
  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:
    ApiResponse:
      type: object
      properties:
        http_code:
          type: integer
          example: 200
        response_code:
          type: string
          example: SUCCESS
        response_msg:
          type: string
        data:
          type: object
    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
    SmsMessageCollection:
      type: object
      properties:
        messages:
          type: array
          items:
            $ref: '#/components/schemas/SmsMessage'
      required:
        - messages
    MmsMessage:
      type: object
      properties:
        source:
          type: string
          default: sdk
        from:
          type: string
        body:
          type: string
        to:
          type: string
        subject:
          type: string
        media_file:
          type: string
          description: URL of the uploaded media file.
        schedule:
          type: integer
        country:
          type: string
      required:
        - to
        - subject
        - media_file
    MmsMessageCollection:
      type: object
      properties:
        media_file:
          type: string
        messages:
          type: array
          items:
            $ref: '#/components/schemas/MmsMessage'
      required:
        - messages
    VoiceMessage:
      type: object
      properties:
        source:
          type: string
          default: sdk
        body:
          type: string
          description: Text to be read aloud via text-to-speech.
        to:
          type: string
        lang:
          type: string
          description: Language / voice code, e.g. en-us.
        voice:
          type: string
          enum: [female, male]
        schedule:
          type: integer
        custom_string:
          type: string
        country:
          type: string
        machine_detection:
          type: integer
        require_input:
          type: integer
      required:
        - body
        - to
        - lang
        - voice
    VoiceMessageCollection:
      type: object
      properties:
        messages:
          type: array
          items:
            $ref: '#/components/schemas/VoiceMessage'
      required:
        - messages
    Email:
      type: object
      properties:
        to:
          type: array
          items:
            type: object
            properties:
              email:
                type: string
              name:
                type: string
        cc:
          type: array
          items:
            type: object
        bcc:
          type: array
          items:
            type: object
        from:
          type: object
          properties:
            email_address_id:
              type: integer
            name:
              type: string
        subject:
          type: string
        body:
          type: string
        attachments:
          type: array
          items:
            type: object
        schedule:
          type: integer
      required:
        - to
        - from
        - subject
        - body
    PostLetter:
      type: object
      properties:
        file_url:
          type: string
          description: URL of the uploaded PDF to print and mail.
        template_used:
          type: integer
        colour:
          type: integer
          description: 1 for colour, 0 for black and white.
        duplex:
          type: integer
          description: 1 for double-sided, 0 for single-sided.
        priority_post:
          type: integer
        recipients:
          type: array
          items:
            $ref: '#/components/schemas/PostRecipient'
      required:
        - file_url
        - recipients
    PostPostcard:
      type: object
      properties:
        file_url:
          type: string
          description: URL of the uploaded PDF design to print and mail.
        recipients:
          type: array
          items:
            $ref: '#/components/schemas/PostRecipient'
      required:
        - file_url
        - recipients
    PostRecipient:
      type: object
      properties:
        address_name:
          type: string
        address_line_1:
          type: string
        address_line_2:
          type: string
        address_city:
          type: string
        address_state:
          type: string
        address_postal_code:
          type: string
        address_country:
          type: string
        return_address_id:
          type: integer
        schedule:
          type: integer
      required:
        - address_name
        - address_line_1
        - address_city
        - address_postal_code
        - address_country
    ContactList:
      type: object
      properties:
        list_name:
          type: string
      required:
        - list_name
    Contact:
      type: object
      properties:
        first_name:
          type: string
        last_name:
          type: string
        email:
          type: string
        phone_number:
          type: string
        fax_number:
          type: string
        organization_name:
          type: string
        address_line_1:
          type: string
        address_city:
          type: string
        address_state:
          type: string
        address_postal_code:
          type: string
        address_country:
          type: string
        custom_1:
          type: string
    Upload:
      type: object
      properties:
        content:
          type: string
          description: Base64-encoded or hosted file content reference.
      required:
        - content
    AutomationRule:
      type: object
      properties:
        rule_name:
          type: string
        url:
          type: string
          description: Webhook URL to which events are forwarded.
        dedicated_number:
          type: string
        enabled:
          type: integer
      required:
        - url