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

# WhatsApp Business API

- [WhatsApp Business API](https://docs.innopaas.com/api-reference/api-reference-en/whatsapp-business-api/whatsapp-business-api.md): The InnoPaaS platform provides enterprise customers with integrated support for sending Meta WhatsApp messages and offers unified API interface technical support. The unified data encoding format for this protocol is UTF-8. The interface uses HTTPS, and the TLS protocol version is >=1.2. User authentication for the interface uses Authorization in the request header; see 2.1 Common Request Headers for details.
- [Message](https://docs.innopaas.com/api-reference/api-reference-en/whatsapp-business-api/whatsapp-business-api/message.md)
- [Template (Asynchronous)](https://docs.innopaas.com/api-reference/api-reference-en/whatsapp-business-api/whatsapp-business-api/template-asynchronous.md)
- [Template (Synchronous)](https://docs.innopaas.com/api-reference/api-reference-en/whatsapp-business-api/whatsapp-business-api/template-synchronous.md)
- [File Upload](https://docs.innopaas.com/api-reference/api-reference-en/whatsapp-business-api/whatsapp-business-api/file-upload.md)
- [Number Lookup](https://docs.innopaas.com/api-reference/api-reference-en/whatsapp-business-api/whatsapp-business-api/number-lookup.md)
- [WebHook](https://docs.innopaas.com/api-reference/api-reference-en/whatsapp-business-api/webhook.md)
- [Configure WebHook](https://docs.innopaas.com/api-reference/api-reference-en/whatsapp-business-api/webhook/configure-webhook.md): When there are message updates in Waba, update events are pushed to customers via Webhook. These include message status updates, user reply messages, Waba account review status updates, WhatsApp template status updates, sender display name changes, and more.
- [Message Status](https://docs.innopaas.com/api-reference/api-reference-en/whatsapp-business-api/webhook/message-status.md)
- [Inbound Message](https://docs.innopaas.com/api-reference/api-reference-en/whatsapp-business-api/webhook/inbound-message.md)
- [Template Status](https://docs.innopaas.com/api-reference/api-reference-en/whatsapp-business-api/webhook/template-status.md)
- [Inbox Chat Message Events](https://docs.innopaas.com/api-reference/api-reference-en/whatsapp-business-api/webhook/inbox-chat-message-events.md): Chatroom inbound and outbound messages are only for listening to message events in the chatroom.
- [Number (sender) Callback](https://docs.innopaas.com/api-reference/api-reference-en/whatsapp-business-api/webhook/number-sender-callback.md)
- [Waba Account Callback](https://docs.innopaas.com/api-reference/api-reference-en/whatsapp-business-api/webhook/waba-account-callback.md)
- [Error Codes](https://docs.innopaas.com/api-reference/api-reference-en/whatsapp-business-api/error-codes.md)
- [Custom Error Codes](https://docs.innopaas.com/api-reference/api-reference-en/whatsapp-business-api/error-codes/custom-error-codes.md)
- [Meta Error Codes](https://docs.innopaas.com/api-reference/api-reference-en/whatsapp-business-api/error-codes/meta-error-codes.md)
- [Language Code](https://docs.innopaas.com/api-reference/api-reference-en/whatsapp-business-api/language-code.md)