The payment distribution between the app provider and Google is typically based on a revenue share model. Google takes a percentage of the revenue generated by the app, usually around 30%, as their fee for hosting the app on the Google Play Store and providing various services such as payment processing and user acquisition. The app provider receives the remaining revenue. In terms of the system architecture, the payment process typically involves the Google Play Billing Library, which provides an interface for app developers to sell digital content within their apps. When a user makes a purchase, the Google Play Billing Library handles the payment processing and communicates with the Google Play Store to verify the purchase and distribute the revenue. The app provider can then access the revenue share through their Google Play Console. Overall, this revenue share model and payment process allows for a streamlined and secure way for app providers to monetize their apps on the Google Play Store while also ensuring that Google is compensated for their services.