How do multiple integration event handlers guarantee the idempotence of this integration event

[吼姆拉]

In UserCheckoutAcceptedIntegrationEventHandler, I see that the IdentifiedCommand is created to ensure that consumption is not repeated.
var requestCreateOrder = new IdentifiedCommand<CreateOrderCommand, bool>(createOrderCommand, @event.RequestId);

When CheckoutAcceptedIntegrationEvent have more than one handler, and requires each handler not repeat consumption, create IdentifiedCommand in each handler, do not conflict? Because they both use the same @event.RequestId as the Id of the IdentifiedCommand.

Thank you very much.