You cannot download an official WhatsApp app for the PlayStation Vita because Meta does not support the console. Sony officially discontinued the PS Vita hardware in 2019, and the remaining ecosystem lacks modern application support. However, you can still access your chats on the handheld device using specialized workarounds.
: The PlayStation Store on Vita does not list WhatsApp or similar modern messaging clients. Furthermore, the Vita’s built-in web browser uses outdated security protocols that prevent it from loading modern web-based services like WhatsApp Web. The Community Perspective whatsapp for ps vita