The number of push notification impressions is simply the number of times your notification was displayed. Whenever a notification is shown to a subscriber, it counts as one impression.
Let's say you have 100 subscribers and you just sent out a new notification to all of them. But if 10 of them don't see the notification, you will have wasted 10 impressions.
PushOwl tracks impressions, which means, only the notifications that your subscribers have SEEN are counted towards your plan. This means that instead of counting notifications, campaigns, or even subscribers, we only track what has worked for you or your business i.e. impressions of your notifications.
This ensures you won't pay for something which your subscribers never saw.