> For the complete documentation index, see [llms.txt](https://docs.connectly.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.connectly.ai/message-api.md).

# Message API

- [Message Service API](https://docs.connectly.ai/message-api/message-service-api.md)
- [MessageService](https://docs.connectly.ai/message-api/message-service-api/messageservice.md)
- [Send template message](https://docs.connectly.ai/message-api/message-service-api/messageservice/send-template-message.md): API to send a WhatsApp templated message to recipient.
- [Send session message](https://docs.connectly.ai/message-api/message-service-api/messageservice/send-session-message.md): Send a message to recipient on target channel, i.e. WhatsApp, SMS.
- [Error codes](https://docs.connectly.ai/message-api/message-service-api/error-codes.md)
- [Webhook API](https://docs.connectly.ai/message-api/webhook-api.md)
- [WebhookService](https://docs.connectly.ai/message-api/webhook-api/webhookservice.md)
- [Create a webhook registration by event topic](https://docs.connectly.ai/message-api/webhook-api/webhookservice/create-a-webhook-registration-by-event-topic.md)
- [Update an existing webhook registration by event topic](https://docs.connectly.ai/message-api/webhook-api/webhookservice/update-an-existing-webhook-registration-by-event-topic.md)
- [Get webhook registrations for business](https://docs.connectly.ai/message-api/webhook-api/webhookservice/get-webhook-registrations-for-business.md)
- [Delete a webhook registration for business](https://docs.connectly.ai/message-api/webhook-api/webhookservice/delete-a-webhook-registration-for-business.md)
- [Webhook Payload](https://docs.connectly.ai/message-api/webhook-api/webhook-payload.md)
- [Delivery Status Error Codes](https://docs.connectly.ai/message-api/webhook-api/webhook-payload/delivery-status-error-codes.md)
- [Payload Media Types](https://docs.connectly.ai/message-api/webhook-api/webhook-payload/payload-media-types.md)
- [Business-scoped user IDs (BSUID)](https://docs.connectly.ai/message-api/business-scoped-user-ids-bsuid.md): How Connectly surfaces WhatsApp Business-Scoped User IDs (BSUIDs) for customers who adopt a WhatsApp username, and how to enable support.


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