During September 2025, Karthikeyan Ramasamy developed recurring payments support in the Braintree iOS SDK’s App Switch flow, enhancing the braintree/braintree_ios repository. He implemented new recurring payment fields and ensured billing plan metadata is passed during App Switch, allowing merchants to initiate recurring transactions without requiring an immediate purchase. Using Swift and leveraging his expertise in payment integration and SDK development, Karthikeyan added comprehensive unit tests to validate the new flow and maintained backward compatibility with existing integrations. His work improved monetization options for merchants, reduced integration friction, and was delivered with updated documentation and code comments to support ongoing maintainability.