> ## Documentation Index > Fetch the complete documentation index at: https://docs.lobbystack.com/llms.txt > Use this file to discover all available pages before exploring further. # Get a link that connects Cal.com > Cal.com asks the account's owner to agree in a browser, so the API can't connect an account by itself: send the link this returns to whoever owns the Cal.com account. They sign in to LobbyStack as an owner or admin of the business, agree on Cal.com's page, and land on the dashboard's integrations page, where they can pick the event type to book; PATCH /calendars/{connection_id} can pick it too. Each appointment becomes a booking of that event type, made under a stand-in email address so Cal.com never emails the caller, and the account's bookings count as busy time. The link works until expires_at. Connecting another Cal.com account replaces the business's Cal.com connection, the one without a staff member. A deployment without Cal.com answers 403. ## OpenAPI ````yaml /api-reference/openapi.json post /calendars/calcom/connect openapi: 3.1.0 info: title: LobbyStack API version: v1 description: >- Read calls, contacts, appointments and messages, book appointments, and subscribe to webhooks. Authenticate with an API key in the Authorization header. A platform key also names the business it acts on in the LobbyStack-Business header. Each key allows 120 requests per minute by default. servers: - url: https://app.lobbystack.com/api/v1 security: - bearerAuth: [] tags: - name: Business - name: Receptionist - name: Agents - name: Billing - name: Phone numbers - name: Onboarding - name: Team - name: Website chat - name: Calendars - name: Notifications - name: Calls - name: Contacts - name: Appointments - name: Messages - name: Knowledge - name: Webhooks - name: Platform - name: Partner paths: /calendars/calcom/connect: post: tags: - Calendars summary: Get a link that connects Cal.com description: >- Cal.com asks the account's owner to agree in a browser, so the API can't connect an account by itself: send the link this returns to whoever owns the Cal.com account. They sign in to LobbyStack as an owner or admin of the business, agree on Cal.com's page, and land on the dashboard's integrations page, where they can pick the event type to book; PATCH /calendars/{connection_id} can pick it too. Each appointment becomes a booking of that event type, made under a stand-in email address so Cal.com never emails the caller, and the account's bookings count as busy time. The link works until expires_at. Connecting another Cal.com account replaces the business's Cal.com connection, the one without a staff member. A deployment without Cal.com answers 403. operationId: createCalcomConnectLink parameters: - name: LobbyStack-Business in: header description: >- The business a platform key acts on. Required with a platform key. A per-business key may leave it out; if it sends one, it must be the key's own business. schema: type: string format: uuid responses: '201': description: Created content: application/json: schema: type: object required: - data properties: data: $ref: '#/components/schemas/CalendarConnectLink' '400': description: >- The request is invalid (invalid_request), or a platform key sent no LobbyStack-Business header (business_required). content: application/json: schema: $ref: '#/components/schemas/Error' '401': description: The API key is missing, invalid, or revoked (unauthorized). content: application/json: schema: $ref: '#/components/schemas/Error' '403': description: >- Refused. insufficient_scope: the key lacks the business:write scope. forbidden: a per-business key named another business in LobbyStack-Business. key_owner_inactive: the person the key acts for can't any more: a per-business key's creator is no longer an owner or admin, or a platform key's owner_email has no verified LobbyStack account. content: application/json: schema: $ref: '#/components/schemas/Error' '404': description: A platform key named a business it cannot act on (not_found). content: application/json: schema: $ref: '#/components/schemas/Error' '409': description: The request conflicts with the current state. content: application/json: schema: $ref: '#/components/schemas/Error' '429': description: >- Too many requests (rate_limited). Wait for the Retry-After header's number of seconds. content: application/json: schema: $ref: '#/components/schemas/Error' headers: Retry-After: schema: type: integer description: Seconds to wait. security: - bearerAuth: [] components: schemas: CalendarConnectLink: type: object properties: url: type: string description: >- The link to open in a browser. Whoever opens it signs in to LobbyStack as an owner or admin of the business, then agrees on Google's page. expires_at: type: string format: date-time description: The link works until then. required: - url - expires_at additionalProperties: false description: A link that connects a Google Calendar to the business. Error: type: object properties: error: type: object properties: code: type: string enum: - invalid_request - unauthorized - forbidden - insufficient_scope - not_found - conflict - idempotency_key_reused - idempotency_request_in_progress - booking_disabled - booking_requires_confirmation - slot_unavailable - rate_limited - rate_limit_unavailable - method_not_allowed - internal_error - business_required - key_owner_inactive - plan_limit_reached - phone_numbers_unavailable message: type: string details: type: array items: type: object properties: path: type: string message: type: string required: - path - message additionalProperties: false required: - code - message additionalProperties: false required: - error additionalProperties: false securitySchemes: bearerAuth: type: http scheme: bearer description: >- An API key from Settings > API keys (lsk_...), which acts on its own business, or a platform key from the PLATFORM_API_KEYS setting (lsp_...), which onboards and manages businesses. Scopes: business:read, business:write, calls:read, contacts:read, contacts:write, appointments:read, appointments:write, messages:read, knowledge:read, knowledge:write, webhooks:manage, billing:manage, phone_numbers:manage, team:manage, businesses:create, users:create, phone_numbers:purchase, partner:read, partner.businesses:write, partner.demos:write, partner.packages:write, partner.branding:write, partner.templates:write, partner.team:write, partner.billing:read, partner.billing:write. Only platform keys can hold businesses:create and users:create, and only a key a partner made in its console can hold the partner scopes, which the Partner endpoints use. Only a partner's owners grant partner.billing:read and partner.billing:write. ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.