# EXTRAS

- [WhatsApp Business API - Unsupported Messages](/extras/whatsapp-business-api-unsupported-messages.md): The reason why business might receive a empty message from user
- [Understanding Message Delivery Issues on WhatsApp](/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](/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.