Verifies an endpoint owner's intent to receive messages by validating the token
            sent to the endpoint by an earlier Subscribe action.
            If the token is valid, the action creates a new subscription and returns its
            Amazon Resource Name (ARN).
            
 Declaration Syntax
 Declaration Syntax| C# | 
public ConfirmSubscriptionResponse ConfirmSubscription( ConfirmSubscriptionRequest request )
 Parameters
 Parameters- request (ConfirmSubscriptionRequest)
- Confirm Subscription request
 Return Value
 Return ValueConfirm Subscription  Response from the service
 Remarks
 Remarks
            This call requires an AWS signature only when the AuthenticateOnUnsubscribe
            flag is set to "true".