Why do I need to create an Application

Each user is required to create an application in order to avoid reaching the PushOver API call limit. Sonarr has reached a point where its best for our users and for PushOver if each user has their own account. This avoids hitting the API limit like we did in December 2013.

What does this new application give me

It gives you the ability to send up to 7500 messages per month, instead of the current 15000 limit we have imposed for all users.

Where do I get the API Key?

The API Key is found within application you created for your Sonarr, if you need to create one, you can do so here: https://pushover.net/apps/clone/nzbdrone