> ## Documentation Index > Fetch the complete documentation index at: https://developers.huechat.ai/llms.txt > Use this file to discover all available pages before exploring further. # Book a native appointment for this question > One booking per session/question/version. Identical retries 200/replayed; changed request 409. Server derives service and tenant from published question. A typed phone never resolves a saved CDP profile; only invitation binding can. Booking creates actual native appointment/events before final form submit. Store receipt unchanged. ## OpenAPI ````yaml /api-reference/openapi.json post /api/v2/forms/{publicCode}/schedule/book openapi: 3.0.3 info: contact: name: HueChat support email: support@huechat.ai url: https://huechat.ai/contact description: >- Account-scoped REST API for HueChat: conversations, messages, contacts, Customer CDP, Sales CRM, forms, appointments, inboxes, teams, agents, AI agents and knowledge, WhatsApp templates and broadcasts, workflows and chat menus. Authenticate with account-scoped API keys; every route is scoped to your own account. license: name: Proprietary url: https://huechat.ai/terms termsOfService: https://huechat.ai/terms title: HueChat API version: 2.0.0 servers: - url: https://app.huechat.ai description: Production security: - bearerAuth: [] tags: - name: Agents description: The human agents on your account and their availability. - name: AI Agents description: >- Assistants you build to answer customers on their own: persona, language, guardrails, tools and a knowledge base, published to inboxes, replying in Arabic or English until they hand off to a human. Create, publish, test, monitor quality and roll back versions. - name: Broadcasts description: >- Send a WhatsApp template to a list of contacts from a CSV or saved audience, with scheduling, pause and resume, and delivery reports. - name: Chat Menus description: >- Numbered or button-driven menus a customer sees at the start of a conversation. - name: Contacts description: >- The people your team talks to: phone, email, name, custom attributes, labels and notes. One contact can have conversations on several channels. - name: Conversations description: >- A conversation is one thread between a contact and your team on one channel, with status, assignee, team, labels, priority and custom attributes. List, filter, search, assign, resolve and annotate them. - name: Forms description: >- Form management, assets, delivery, respondent sessions, submissions, scheduling, reports and AI-assisted authoring in one group. - name: Inboxes description: >- Connected channels: a WhatsApp Business number, an Instagram or Messenger page, an email address or a website live-chat widget. Inboxes decide where a conversation comes from and who can see it. - name: Knowledge description: >- Documents, web pages and text that ground an AI agent's answers. Upload, point at a URL or paste text; HueChat indexes it and the agent cites it. - name: Messages description: >- Everything said inside a conversation: text, attachments, WhatsApp templates and interactive replies. Sending through the API delivers on the conversation's channel and shows in the inbox like any agent reply. - name: Sales CRM description: >- The full tenant-scoped Sales workspace: Leads, Companies, Deals, tasks, products, price books, quotes, payments, forecasts, reports and settings. - name: Teams description: Groups of agents used for assignment and reporting. - name: Templates description: >- Pre-approved WhatsApp message formats required by Meta for business-initiated messages. Create, sync from Meta, AI-generate, test-send and read analytics. - name: Workflows description: >- Automation flows built from triggers and steps: route, tag, reply, wait, hand off. Create, publish, version and toggle. paths: /api/v2/forms/{publicCode}/schedule/book: parameters: - $ref: '#/components/parameters/publicCode' post: tags: - Forms summary: Book a native appointment for this question description: >- One booking per session/question/version. Identical retries 200/replayed; changed request 409. Server derives service and tenant from published question. A typed phone never resolves a saved CDP profile; only invitation binding can. Booking creates actual native appointment/events before final form submit. Store receipt unchanged. operationId: postApiV2FormsPubliccodeScheduleBook requestBody: required: true content: application/json: schema: type: object properties: session_id: type: string invite: type: string question_id: type: string resource_id: type: string format: uuid starts_at: type: string format: date-time customer_name: type: string customer_phone: type: string customer_email: type: string required: - session_id - question_id - resource_id - starts_at - customer_name - customer_phone additionalProperties: false responses: '200': description: Identical booking replay content: application/json: schema: type: object properties: booking: $ref: '#/components/schemas/BookingReceipt' replayed: type: boolean enum: - true '201': description: Success content: application/json: schema: type: object properties: booking: $ref: '#/components/schemas/BookingReceipt' replayed: type: boolean '400': $ref: '#/components/responses/BadRequest' '403': $ref: '#/components/responses/Forbidden' '404': $ref: '#/components/responses/NotFound' '409': $ref: '#/components/responses/Conflict' '410': $ref: '#/components/responses/Gone' '422': $ref: '#/components/responses/ValidationError' '429': $ref: '#/components/responses/RateLimited' '503': $ref: '#/components/responses/Unavailable' security: [] components: parameters: publicCode: name: publicCode in: path required: true schema: type: string minLength: 8 maxLength: 24 schemas: BookingReceipt: type: object properties: booking_id: type: string format: uuid appointment_id: type: string pattern: ^[A-Za-z0-9_-]{1,80}$ description: Native appointment public identifier, not UUID. starts_at: type: string format: date-time ends_at: type: string format: date-time service_name: type: string resource_name: type: string timezone: type: string required: - booking_id - appointment_id - starts_at - ends_at - service_name - resource_name - timezone Error: type: object properties: error: type: string responses: BadRequest: description: Malformed request, invalid ID/filter or unknown top-level field. content: application/json: schema: $ref: '#/components/schemas/Error' Forbidden: description: Invitation, session, membership, or consent requirement not met. content: application/json: schema: $ref: '#/components/schemas/Error' NotFound: description: Form not found in the account or not publicly available. content: application/json: schema: $ref: '#/components/schemas/Error' Conflict: description: Stale version, duplicate response, or already used invitation. content: application/json: schema: $ref: '#/components/schemas/Error' Gone: description: Published expiry or response cap reached. content: application/json: schema: $ref: '#/components/schemas/Error' ValidationError: description: The request or definition is invalid. content: application/json: schema: $ref: '#/components/schemas/Error' RateLimited: description: >- Public admission, upload or AI quota exceeded. Reserved AI failures count. content: application/json: schema: $ref: '#/components/schemas/Error' Unavailable: description: Dependency/configuration unavailable; fail closed. content: application/json: schema: $ref: '#/components/schemas/Error' securitySchemes: bearerAuth: type: http scheme: bearer description: >- Your personal access token where supported, or a scoped API key (`hc_…`) created inside HueChat at Account → Developer API. Send it as `Authorization: Bearer `. ````