openapi: 3.1.0
info:
  title: Cellulant Tingg Checkout Acknowledgement Engagement API
  description: 'Tingg Checkout 3.0 — accept payments across 25+ African markets through

    a single integration. Supports Express Checkout (hosted/modal) and Custom

    Checkout (host-to-host) for mobile money, cards, and direct bank transfer.

    '
  version: 3.0.0
  contact:
    name: Cellulant Developer Support
    url: https://developer.tingg.africa
    email: developer@cellulant.io
  license:
    name: Cellulant Terms of Service
    url: https://www.cellulant.io/terms
servers:
- url: https://api.tingg.africa
  description: Production
- url: https://api-approval.tingg.africa
  description: Sandbox
security:
- BearerAuth: []
  ApiKeyAuth: []
tags:
- name: Engagement
  description: Outbound SMS notifications and OTPs.
paths:
  /api/v2/engagement:
    post:
      summary: Send Engagement Message
      description: Queue an SMS notification (OTP, transactional, or standard). Delivery status is reported via callback to the supplied callbackUrl.
      operationId: sendEngagement
      tags:
      - Engagement
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/EngagementRequest'
            examples:
              SmsEngagementExample:
                $ref: '#/components/examples/SmsEngagementExample'
      responses:
        '200':
          description: Message queued
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/EngagementResponse'
              examples:
                EngagementResponseExample:
                  $ref: '#/components/examples/EngagementResponseExample'
        4XX:
          $ref: '#/components/responses/ErrorResponse'
components:
  examples:
    EngagementResponseExample:
      summary: Message queued
      value:
        transactionID: 8f6b2c80-43f7-4f78-b1d2-7a3a5d6c1e0a
        statusCode: 200
        message: Message queued successfully.
    SmsEngagementExample:
      summary: Send a templated OTP
      value:
        notificationType: OTP
        channels:
        - SMS
        referenceID: ref-cas-123
        callbackUrl: https://merchant.example.co.ke/sms/callback
        smsDto:
          msisdn:
          - '254712345678'
          message: Your Tingg OTP is ${code}. Valid for 5 minutes.
          params:
            code: '648291'
          senderID: TINGG
  schemas:
    SmsDto:
      type: object
      required:
      - msisdn
      - message
      properties:
        msisdn:
          type: array
          items:
            type: string
          description: One or more recipient phone numbers in E.164 format.
        message:
          type: string
          description: Message body; supports `${placeholder}` substitution.
        params:
          type: object
          additionalProperties:
            type: string
        senderID:
          type: string
    Error:
      type: object
      properties:
        statusCode:
          type: integer
        message:
          type: string
    EngagementRequest:
      type: object
      required:
      - notificationType
      - channels
      - referenceID
      - smsDto
      properties:
        notificationType:
          type: string
          enum:
          - OTP
          - TRX
          - STANDARD
          - SMS_TEST
        channels:
          type: array
          items:
            type: string
            enum:
            - SMS
        referenceID:
          type: string
        callbackUrl:
          type: string
          format: uri
        smsDto:
          $ref: '#/components/schemas/SmsDto'
    EngagementResponse:
      type: object
      properties:
        transactionID:
          type: string
          format: uuid
        statusCode:
          type: integer
          example: 200
        message:
          type: string
  responses:
    ErrorResponse:
      description: Error response
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  securitySchemes:
    BearerAuth:
      type: http
      scheme: bearer
      bearerFormat: JWT
    ApiKeyAuth:
      type: apiKey
      in: header
      name: apikey
      description: Merchant apiKey issued in the Tingg integration dashboard.