> ## Documentation Index > Fetch the complete documentation index at: https://docs.voice.wixzel.com/llms.txt > Use this file to discover all available pages before exploring further. # Create a message template > Write a template and submit it to Meta for review. It starts `PENDING`; Meta approves or rejects it, usually within minutes, and the status updates by itself. Only an `APPROVED` template can be sent. Number the body’s values `{{1}}`, `{{2}}`, … and give one example value for each. Requires `whatsapp:write`. ## OpenAPI ````yaml /openapi.json post /v1/whatsapp/templates openapi: 3.1.0 info: title: Wixzel Voice API version: '2026-09-01' description: >- APIs for agentic telephony. One API key, one balance, every voice engine. ## Authentication Send your key as `Authorization: Bearer wv_live_...`. Keys are scoped: grant only what an integration needs. There is no admin scope. ## Versioning The `/v1` prefix covers additive changes. Behavioural changes ship behind a dated `Wixzel-Version` header, and existing keys keep the behaviour they were created with. ## Money Amounts are integer **micro-USD** (1,000,000 = $1.00). Voice usage is billed per second, per token and per character, so a float dollar figure cannot represent it without disagreeing with the ledger. ## Errors Every error carries a stable `code` and a `request_id`. Match on `code`; the `message` is for humans and may change. contact: name: Wixzel Voice url: https://voice.wixzel.com servers: - url: https://api.voice.wixzel.com description: Production security: [] tags: - name: Calls description: Place calls and read what happened on them. - name: Realtime description: Talk to an agent from a browser or app, with no phone line. - name: Agents description: >- The prompt, voice and behaviour of a caller, and its mascot: the animated face people see on your share link, your website and in your apps. - name: Leads description: People to call, and data to merge into prompts. - name: Campaigns description: Call a list of leads with one agent. - name: Knowledge bases description: Facts an agent can draw on mid-call. - name: Phone numbers description: Numbers on your SIP trunks. - name: SIP trunks description: Your carrier connections. - name: Appointments description: Bookings, including ones agents make on calls. - name: Usage description: Itemised billing lines. - name: Billing description: Balance, ledger and top-ups. - name: API keys description: Create, scope and rotate keys. - name: Engines description: What the platform can serve, and what it costs. - name: Voices description: Cloned voices, made from your own recordings, for your agents to speak in. - name: Callers description: Who called your agents, where from and on what, and the blocklist. - name: Webhooks description: Where events are sent, and what happened when they got there. - name: MCP servers description: Other apps’ tools, for agents to use while they are on a call. - name: Tools description: >- Your own tools, for agents to use while they are on a call: a webhook to your server, or an action in the caller’s app. - name: WhatsApp description: >- WhatsApp business numbers, the agents that answer their chats, and messages agents send. - name: Meetings description: >- Agents in Zoom, Google Meet and Teams meetings, through your own Attendee account. paths: /v1/whatsapp/templates: post: tags: - WhatsApp summary: Create a message template description: >- Write a template and submit it to Meta for review. It starts `PENDING`; Meta approves or rejects it, usually within minutes, and the status updates by itself. Only an `APPROVED` template can be sent. Number the body’s values `{{1}}`, `{{2}}`, … and give one example value for each. Requires `whatsapp:write`. requestBody: content: application/json: schema: $ref: '#/components/schemas/CreateWhatsAppTemplate' responses: '201': description: The template, pending Meta’s review content: application/json: schema: $ref: '#/components/schemas/WhatsAppTemplate' '400': description: Invalid request content: application/json: schema: $ref: '#/components/schemas/Error' '401': description: Missing or invalid API key content: application/json: schema: $ref: '#/components/schemas/Error' '403': description: Key lacks the required scope content: application/json: schema: $ref: '#/components/schemas/Error' '404': description: No such record content: application/json: schema: $ref: '#/components/schemas/Error' '409': description: The number already has a template with this name and language content: application/json: schema: $ref: '#/components/schemas/Error' '429': description: Rate limited. Retry after the interval in `Retry-After`. content: application/json: schema: $ref: '#/components/schemas/Error' security: - bearerAuth: [] components: schemas: CreateWhatsAppTemplate: type: object properties: account_id: type: string pattern: ^[0-9a-f]{24}$ example: 6a96a3ead6e886d42462dd3e name: type: string pattern: ^[a-z0-9_]{1,512}$ description: Lowercase letters, digits and underscores. example: visit_reminder language: type: string pattern: ^[a-z]{2,3}(_[A-Z]{2})?$ default: en_US description: A WhatsApp language code, e.g. en_US, en, hi, ml. example: en_US category: type: string enum: - UTILITY - MARKETING description: >- UTILITY for confirmations, reminders and updates; MARKETING for offers. Meta may re-categorise it. header: type: string maxLength: 60 description: An optional bold first line, plain text, no placeholders. body: type: string minLength: 1 maxLength: 1024 description: The message. Values go in as {{1}}, {{2}}, … in order. example: Hi {{1}}, a reminder of your visit on {{2}}. examples: type: array items: type: string minLength: 1 maxLength: 200 maxItems: 20 default: [] description: >- One sample value per placeholder, in order. Meta needs them to review the template. example: - Asha - Thursday at 4 pm footer: type: string maxLength: 60 description: An optional small grey last line. required: - account_id - name - category - body WhatsAppTemplate: type: object properties: id: type: string pattern: ^[0-9a-f]{24}$ example: 6a96a3ead6e886d42462dd3e object: type: string enum: - whatsapp_template account_id: type: string pattern: ^[0-9a-f]{24}$ example: 6a96a3ead6e886d42462dd3e name: type: string language: type: string example: en_US category: type: - string - 'null' description: MARKETING, UTILITY or AUTHENTICATION. example: UTILITY status: type: - string - 'null' example: APPROVED body: type: string example: Hi {{1}}, your appointment is on {{2}} at {{3}}. parameter_count: type: integer description: How many values the body takes, in order. parameter_names: type: array items: type: string description: The names of the values, for templates with named parameters. header_format: type: - string - 'null' synced_at: type: string format: date-time description: ISO 8601, always UTC. example: '2026-09-01T12:00:00.000Z' required: - id - object - account_id - name - language - category - status - body - parameter_count - parameter_names - header_format - synced_at Error: type: object properties: error: type: object properties: type: type: string enum: - invalid_request_error - authentication_error - permission_error - rate_limit_error - insufficient_credits - not_found_error - conflict_error - api_error code: type: string description: Stable machine-readable code. example: agent_not_found message: type: string description: >- Human-readable explanation. Do not match on this — match on code. param: type: string description: Which field caused the failure, when applicable. doc_url: type: string request_id: type: string description: Quote this when asking for help. example: req_01HXYZ... required: - type - code - message - request_id required: - error securitySchemes: bearerAuth: type: http scheme: bearer description: >- Your Wixzel Voice API key: `Authorization: Bearer wv_live_...`. Keys are scoped; grant only what the integration needs. ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.