About creating ads on the WhatsApp Business app
From within the WhatsApp Business app, you can create Facebook and Instagram ads that lead to a WhatsApp chat with you.
As a business owner, you can create ads directly from the WhatsApp Business app to promote your business, without having to switch to other apps. While creating the ad, you can select ad media, spend, duration, and target audience. You can also pay for the ad, by choosing to use the same payment method as your Facebook ad account.
If you haven't linked your Facebook page with your WhatsApp Business account, your ads will only deliver to Facebook. You can deliver ads to Facebook and Instagram once you have linked your Facebook page to your business.