How do I limit video ads?

Hello all,

More specifically I want to know how I can limit video ads for my "Ad Free" users.

I have 2 modes for the game, the free version in which people engage in video ads that give them a certain amount of in-game currency, and then people who to not see ads but still want that extra currency.

The thing is, Unity allows a maximum of 25 ads per user and I can do the Advertisement.IsReady() method, but if the user is paid they don't use the Unity Ads so I can't check to see how many ads that user seen that day.

I was wondering how I can check to see how many videos the user seen, and if it's < 25 then give the currency, otherwise let them know they watched too many. Then at a specific time of day, reset the Ads count.

Thanks!