asSnsTopicArnOrNull
Casts this NotificationTargetItem as a SnsTopicArn and retrieves its kotlin.String value. Returns null if the NotificationTargetItem is not a SnsTopicArn.
Casts this NotificationTargetItem as a SnsTopicArn and retrieves its kotlin.String value. Returns null if the NotificationTargetItem is not a SnsTopicArn.