How page views and license are handled in the the application?

I would like to understand this thing from the API endpoints perspective:

I mean, when that calls are counted.
*when the token is valid?
*when we have 403 forbidden error, this call is ignore in the count?
*when we reach the max allowed of call per license? what will it happen with the following responses? Will we have some special ERROR code?
*is there any differences between API v1 and v2 calls?

I will appreciate any other information about this

Thanks in advance