openapi: 3.0.3
info:
  title: WHMCS Authentication Support API
  description: The WHMCS API provides an interface to perform operations and actions within WHMCS from external applications and scripts. It supports client management, billing, orders, domain management, support tickets, and system administration.
  version: 1.0.0
  contact:
    name: WHMCS Developer Documentation
    url: https://developers.whmcs.com/api/
  license:
    name: WHMCS License
    url: https://www.whmcs.com/license/
servers:
- url: https://{your-domain}/includes/api.php
  description: WHMCS API endpoint (self-hosted installation)
  variables:
    your-domain:
      default: example.com
      description: Your WHMCS installation domain
security:
- ApiCredentials: []
tags:
- name: Support
  description: Ticket and announcement management
paths:
  /?action=GetTickets:
    post:
      operationId: getTickets
      summary: Get Tickets
      description: Retrieve a list of support tickets from WHMCS.
      tags:
      - Support
      requestBody:
        required: true
        content:
          application/x-www-form-urlencoded:
            schema:
              allOf:
              - $ref: '#/components/schemas/AuthCredentials'
              - type: object
                properties:
                  limitstart:
                    type: integer
                  limitnum:
                    type: integer
                  clientid:
                    type: integer
                    description: Filter by client ID.
                  deptid:
                    type: integer
                    description: Filter by department ID.
                  status:
                    type: string
                    description: Filter by ticket status.
                  subject:
                    type: string
                    description: Search by ticket subject.
      responses:
        '200':
          description: List of support tickets.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/TicketsListResponse'
  /?action=OpenTicket:
    post:
      operationId: openTicket
      summary: Open Ticket
      description: Open a new support ticket in WHMCS.
      tags:
      - Support
      requestBody:
        required: true
        content:
          application/x-www-form-urlencoded:
            schema:
              allOf:
              - $ref: '#/components/schemas/AuthCredentials'
              - type: object
                required:
                - deptid
                - subject
                - message
                - priority
                properties:
                  deptid:
                    type: integer
                    description: Department ID to assign ticket to.
                  subject:
                    type: string
                    description: Ticket subject.
                  message:
                    type: string
                    description: Ticket message body.
                  priority:
                    type: string
                    enum:
                    - Low
                    - Medium
                    - High
                    description: Ticket priority.
                  clientid:
                    type: integer
                    description: Client ID to associate with ticket.
                  name:
                    type: string
                    description: Contact name for the ticket.
                  email:
                    type: string
                    format: email
                    description: Email address for the ticket.
      responses:
        '200':
          description: Ticket opened.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/OpenTicketResponse'
components:
  schemas:
    Ticket:
      type: object
      properties:
        id:
          type: integer
        tid:
          type: string
          description: Public-facing ticket identifier.
        deptid:
          type: integer
        deptname:
          type: string
        userid:
          type: integer
        name:
          type: string
        email:
          type: string
          format: email
        subject:
          type: string
        status:
          type: string
        priority:
          type: string
          enum:
          - Low
          - Medium
          - High
        date:
          type: string
          format: date-time
        lastreply:
          type: string
          format: date-time
        flag:
          type: integer
        service:
          type: string
    TicketsListResponse:
      type: object
      properties:
        result:
          type: string
        totalresults:
          type: integer
        startnumber:
          type: integer
        numreturned:
          type: integer
        tickets:
          type: object
          properties:
            ticket:
              type: array
              items:
                $ref: '#/components/schemas/Ticket'
    OpenTicketResponse:
      type: object
      properties:
        result:
          type: string
        id:
          type: integer
          description: Internal ticket ID.
        tid:
          type: string
          description: Public-facing ticket identifier.
        c:
          type: string
          description: Ticket code for client access.
    AuthCredentials:
      type: object
      required:
      - identifier
      - secret
      - responsetype
      properties:
        identifier:
          type: string
          description: API credential identifier.
        secret:
          type: string
          description: API credential secret key.
        responsetype:
          type: string
          enum:
          - json
          - xml
          default: json
          description: Response format type.
  securitySchemes:
    ApiCredentials:
      type: apiKey
      in: query
      name: identifier
      description: WHMCS API credentials. Provide identifier and secret parameters in the POST request body, along with the action parameter.