Enhancing Android Checkout with Dynamic Callbacks in Google Pay

Google Pay enables Android apps to use onPaymentDataChanged and onPaymentAuthorized callbacks in play-services-wallet:20.0.0 and above. Developers can update shipping, taxes, and prices in real time without closing the payment sheet. The callbacks allow handling authorization feedback directly in the flow. Payments and addresses from Google Wallet are pre-filled when the Pay button is placed on product or cart pages.