PubNub has introduced significant updates to its SDKs, centered around a new "Event Engine" and "Event Listener" APIs, aimed at enhancing developer experience by providing more granular control over event handling. These changes rework the event listener APIs, eliminating the need for a single global PubNub object, allowing developers to scope events to specific entities such as channels or user metadata. The updates harmonize and improve the logic managing communication with PubNub’s backend, optimize presence state management, and standardize retry policies across SDKs. The new architecture supports backward compatibility and offers developers a more flexible and efficient way to manage subscriptions and events, reducing the complexity associated with maintaining a global state. Additionally, the SDKs are being updated to ensure consistent handling of event transitions and retry policies, providing a more predictable experience for developers while maintaining existing functionalities. These improvements are being gradually rolled out across various SDKs with an emphasis on easy migration and support for developers during the transition.