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Getting iOS Push Notifications from a website in response to a specific trigger

Is there a a course or tutorial that could help me with iOS Push Notifications. Generally I can work with push notifications using Firebase because I know how to trigger the notification. What I want to figure out is how to send a notification to an iOS app depending on the specific user and their website. I’m working on an app using the WooCommerce REST API and I want the user (in this case an Administrator) to receive a notification when one of their customers have made a purchase. There is nothing in the REST API that would trigger anything related to a purchase. I can read and write to the website’s database but I can’t listen to realtime changes. I know of two iOS apps that have accomplished this. WooAlert and DashCommerce. I do not want the need for the end user of the app to install a WordPress plugin in order to receive the notification.