openapi: 3.0.3
info:
  title: Gupshup WhatsApp Business Messaging Templates API
  description: 'REST API for sending and managing WhatsApp Business messages through Gupshup. Messages are sent from a registered WhatsApp Business number that is bound to a Gupshup app; requests are authenticated with an `apikey` header tied to your Gupshup account. This document models the WhatsApp messaging surface on `https://api.gupshup.io/wa/api/v1` - sending session messages, sending pre-approved template (HSM) messages, managing user opt-in / opt-out, listing opted-in users, and listing an app''s templates.


    Scope and honesty note: the send-message (`POST /msg`) and send-template (`POST /template/msg`) operations are confirmed against Gupshup''s public API reference. The opt-in / opt-out, users, and template-list operations are documented in Gupshup''s WhatsApp API guide (historically under the `/sm` path, now migrating to the `/wa` path shown here); their request and response bodies are MODELED from the documentation rather than copied from a machine-readable source, and Gupshup uses `application/x-www-form-urlencoded` request bodies. Verify exact field names and response shapes against the live documentation before relying on this specification.'
  version: '1.0'
  contact:
    name: Gupshup
    url: https://www.gupshup.io
  x-modeled: true
servers:
- url: https://api.gupshup.io/wa/api/v1
  description: Gupshup WhatsApp Business API
security:
- apiKeyAuth: []
tags:
- name: Templates
  description: Send and list WhatsApp template (HSM) messages.
paths:
  /template/msg:
    post:
      operationId: sendTemplateMessage
      tags:
      - Templates
      summary: Send a WhatsApp template message
      description: Sends a pre-approved template (HSM) message to an opted-in user, used for business-initiated notifications outside the 24-hour session window. Confirmed endpoint.
      requestBody:
        required: true
        content:
          application/x-www-form-urlencoded:
            schema:
              $ref: '#/components/schemas/SendTemplateRequest'
      responses:
        '202':
          description: Template message accepted for asynchronous delivery.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SendMessageResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '400':
          $ref: '#/components/responses/BadRequest'
  /template/list/{appName}:
    parameters:
    - $ref: '#/components/parameters/AppName'
    get:
      operationId: listTemplates
      tags:
      - Templates
      summary: List an app's templates
      description: Returns the message templates registered for an app along with their approval status. Modeled from documentation.
      responses:
        '200':
          description: A list of templates.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/TemplateListResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
components:
  responses:
    Unauthorized:
      description: Missing or invalid apikey.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    BadRequest:
      description: The request was malformed or missing required parameters.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  schemas:
    SendTemplateRequest:
      type: object
      required:
      - channel
      - source
      - destination
      - template
      - src.name
      properties:
        channel:
          type: string
          example: whatsapp
        source:
          type: string
          description: Registered WhatsApp Business phone number.
        destination:
          type: string
          description: Recipient phone number (must be opted-in).
        template:
          type: string
          description: JSON-encoded template object referencing an approved template id and its parameter values, e.g. {"id":"<template-id>","params":["value1","value2"]}.
          example: '{"id":"00000000-0000-0000-0000-000000000000","params":["Kin","ORD-42"]}'
        message:
          type: string
          description: Optional JSON-encoded media header object for media templates (image / document / video).
        src.name:
          type: string
          description: Gupshup app name registered to the source number.
    TemplateListResponse:
      type: object
      properties:
        status:
          type: string
          example: success
        templates:
          type: array
          items:
            $ref: '#/components/schemas/Template'
    SendMessageResponse:
      type: object
      description: Asynchronous accept response carrying a Gupshup message identifier.
      properties:
        status:
          type: string
          example: submitted
        messageId:
          type: string
          description: Gupshup unique message identifier used to correlate webhook delivery events.
    Template:
      type: object
      properties:
        id:
          type: string
        elementName:
          type: string
        category:
          type: string
        status:
          type: string
          description: Approval status (e.g. APPROVED, PENDING, REJECTED).
        languageCode:
          type: string
        data:
          type: string
          description: Template body text with placeholders.
    Error:
      type: object
      properties:
        status:
          type: string
          example: error
        message:
          type: string
  parameters:
    AppName:
      name: appName
      in: path
      required: true
      description: The Gupshup app name registered to the WhatsApp business number.
      schema:
        type: string
  securitySchemes:
    apiKeyAuth:
      type: apiKey
      in: header
      name: apikey
      description: Account API key sent in the `apikey` request header. Available from the Gupshup dashboard. Scopes requests to your account and its registered apps.