# EXTRAS - [WhatsApp Business API - Unsupported Messages](https://docs.gallabox.com/extras/whatsapp-business-api-unsupported-messages.md): The reason why business might receive a empty message from user - [Understanding Message Delivery Issues on WhatsApp](https://docs.gallabox.com/extras/understanding-message-delivery-issues-on-whatsapp.md): Uncover the reasons behind undelivered WhatsApp messages. From recipient inactivity to country restrictions, explore the common issues and possible solutions for a seamless messaging experience. - [WhatsApp’s New Per-user Messaging Limits](https://docs.gallabox.com/extras/whatsapps-new-per-user-messaging-limits.md): Discover how WhatsApp's per-user message limits impact businesses worldwide. Improve user experience and interaction quality with Gallabox features. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.gallabox.com/extras.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.