> ## Documentation Index > Fetch the complete documentation index at: https://docs.kapso.ai/llms.txt > Use this file to discover all available pages before exploring further. # Attach an existing data endpoint function > Attach a deployed function from the same project and register the flow's Kapso data endpoint with Meta. Multiple flows can share one function. Requires a WhatsApp phone number and flows encryption to be configured. Does not create or deploy a function. Replaces any previous association without deleting the previous function or rotating the endpoint secret. Updating or deploying a shared function affects every flow using it. Published flows are automatically republished; a republish failure returns HTTP 200 with data.warning and leaves the new association in place. ## OpenAPI ````yaml /api/platform/v1/openapi-platform.yaml patch /whatsapp/flows/{flow_id}/data_endpoint openapi: 3.1.0 info: title: Kapso Platform API version: 0.2.0 description: > Build WhatsApp messaging into your product. Manage customers, connect phone numbers, send broadcasts, and handle conversations. servers: - url: https://api.kapso.ai/platform/v1 description: Production security: - ApiKeyAuth: [] tags: - name: Customers description: Manage customer accounts - name: Setup Links description: WhatsApp onboarding via embedded signup - name: Phone Numbers description: Connect and manage WhatsApp numbers - name: Webhooks description: Subscribe to WhatsApp events - name: Display Names description: Update WhatsApp business display names - name: Broadcasts description: | Send template messages at scale **Alpha**: This API is in alpha and subject to change - name: Conversations description: Manage conversation state - name: Media description: Upload media files for WhatsApp messaging - name: Users description: Manage project team members - name: Inbox Embeds description: Create and manage embeddable inbox access links - name: Webhook Deliveries description: View webhook delivery attempts and their status - name: External API Logs description: View logs of external API calls made by the project - name: Log Search description: Search log events across API, Meta, workflow, and webhook sources - name: Events description: Emit and query project-scoped events - name: Provider Models description: List available AI provider models - name: WhatsApp Flows description: Build interactive WhatsApp Flows for surveys and forms - name: Contacts description: Manage WhatsApp contacts - name: Findings description: Detect recurring problems in conversations and investigate them with AI - name: Notifications description: >- Route project alerts to shared inboxes and Slack channels connected from the Kapso app - name: WhatsApp Funding description: >- Read Kapso funding status and recorded messaging and calling usage, and stop portfolio funding paths: /whatsapp/flows/{flow_id}/data_endpoint: parameters: - name: flow_id in: path required: true schema: type: string format: uuid patch: tags: - WhatsApp Flows summary: Attach an existing data endpoint function description: > Attach a deployed function from the same project and register the flow's Kapso data endpoint with Meta. Multiple flows can share one function. Requires a WhatsApp phone number and flows encryption to be configured. Does not create or deploy a function. Replaces any previous association without deleting the previous function or rotating the endpoint secret. Updating or deploying a shared function affects every flow using it. Published flows are automatically republished; a republish failure returns HTTP 200 with data.warning and leaves the new association in place. operationId: updateWhatsappFlowDataEndpoint requestBody: required: true content: application/json: schema: type: object required: - function_id properties: function_id: type: string format: uuid description: >- UUID of an existing deployed function in this project. Null or empty values are rejected. responses: '200': description: >- Function attached and endpoint registered. Check data.warning for republish failures. content: application/json: schema: $ref: '#/components/schemas/WhatsappFlowDataEndpointRegisterResponse' '400': $ref: '#/components/responses/ValidationError' '401': $ref: '#/components/responses/UnauthorizedError' '404': description: Flow or function not found in this project. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '422': description: >- Function is not deployed, phone number or encryption is missing, or Meta rejected the endpoint update. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' components: schemas: WhatsappFlowDataEndpointRegisterResponse: type: object required: - data properties: data: allOf: - $ref: '#/components/schemas/WhatsappFlowDataEndpoint' - type: object properties: flow_id: type: string format: uuid flow_data_endpoint_function_id: type: string format: uuid flow_has_encryption: type: boolean warning: type: - string - 'null' description: The endpoint was updated but automatic republishing failed. ErrorResponse: type: object required: - error properties: error: type: string WhatsappFlowDataEndpoint: type: object required: - function_id - function_name - status properties: function_id: type: string format: uuid function_name: type: string endpoint_url: type: - string - 'null' format: uri status: type: string enum: - draft - deployed - error last_deployed_at: type: - string - 'null' format: date-time code: type: string description: Function source code responses: ValidationError: description: Request validation failed content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' UnauthorizedError: description: Missing or invalid API key content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' securitySchemes: ApiKeyAuth: type: apiKey in: header name: X-API-Key ````