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For Fireblocks’ recommended embedded wallet solution, see Dynamic Embedded Wallets. The documentation below covers the legacy Embedded Wallet APIs and SDKs.
The events handler can be tailored to match your application’s needs. It can be designed to execute various actions, such as refreshing the user interface, recording events, dispatching notifications, or initiating other behaviors specific to your application’s functionality. The events handler object should be provided when initializing the EW SDK. It must implement the following method (following a defined interface): handleEvent(event: Event): void: The method invoked whenever there’s a new event. 
export interface IEventsHandler {  
  handleEvent(event: TEvent): void;  
}