The latest updates to Google Pay- Google Developers Blog

What this post added

Introduced dynamic callbacks (onPaymentAuthorized, onPaymentDataChanged) for Android, enabling upstream Google Pay button placement and real-time updates within the payment sheet. Extended Google Pay support to social app WebViews. Added a cardFundingSource signal to API responses for routing logic and introduced Eftpos routing for Australia. Enabled lifecycle notifications for Google Pay payment tokens to support Merchant-Initiated Transactions (MITs). Launched Cross-Device Authentication to move high-friction desktop checkouts to a mobile-first authentication flow.