How to get number of subscribed users from OneSignal using REST api?

Discuss
#1

Hello there !
I was just checking documentation of OneSignal, there I found some instructions about API’s, using those instructions, can we call number of subscribed users ?
https://documentation.onesignal.com/v5.0/reference#create-notification
I was not able to understand how to use those instructions :thinking::thinking:

#2

I think you will find further informations here

#3