Subscribe App to WhatsApp Business Account
POST https://graph.facebook.com/{{Version}}/{{Assigned-WABA-ID}}/subscribed_apps
Before you can subscribe to get updates on a specific WABA, you need to set up the webhooks product for your Facebook app. See Webhooks, Subscribe to a WhatsApp Business Account for information.
Once you have access to webhooks, you can make the request listed below.