Do I need one service account for every app?

I am already using revenuecat with Google Play for one app. Now I am going to release a second one that also has inapp products.
Do I need do create a second service account in Google Play? (https://docs.revenuecat.com/docs/creating-play-service-credentials 2.) 

2. Create Service Account

Next we need to create a service account. This is done from the Google API Console.

 

2a. Select Create Service Account
 

Or can I use the one I created for my first app also for the second one?

There is no guidance whatsoever if you have several apps and the whole pricess seems very complicated at first glance. I don’t want to break anything in my actively selling app.