WhatsApp Business app is not available for Pixel Watch 2 & Pixel Watch 3. It doesn’t have any official app in the Play Store. Users are always confused with the WhatsApp Messenger app with the Business version. Both are different apps, and you have to download them separately. Users think Facebook has launched WhatsApp for Wear OS or Pixel Watch 3, so the other is also available in the store. The truth is, the latter version is not present for any smartwatches including the Apple Watch & Galaxy Watch.
If you are asking about the notifications, then you can receive them on your watch. You have to enable WhatsApp Business notifications from the pairing app, and then they will be delivered to your Pixel Watch 3. Meta has launched its one app for Wear OS, and the other Facebook Messenger for Apple Watch, so we are not denying it will launch the WhatsApp Business app for the Pixel Watch series in the future.