How do I force user to watch entire ad before giving reward

I'm trying to add an AdmobAd interstitial reward video. How can i make sure the user watches the full ad before giving the reward?

I don't see an event/action for "on interstitial finished" or something like that. Also, I'm guessing that "on interstitial dismissed" i would not give the user the reward?

Any help is greatly appreciated.

Did you try the dismissed method? Seems like it might work.

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Yeah, i have that as an event. Never thought about it though. Just trying to rush this thing through and try my hand at exporting for alpha testing. You know, the whole living in the car thing.

Thank you for all the help you've given. Gonna have to cut you in on some profit sharing.

Thank you, I expect early access and collector's edition.