Reward ad not calling the functions. Why?

Im using Unity and ı want add reward ad in my app. The ad showing when ı click the button but after the ad end, it must be called some function but it doesnt. Example it make coin += 4 but coin doesnt change. Please help me. I cant see the problem. There is no any error. These are my codes :

 

I solve the problem. I tell the solutuion. Create 2 boolean variable(Ex: rewarded, adClosed) and create 2 methot for these.
Method1(object sender, EventArgs args) {
adClosed = true;
}
Method2(object sender, EventArgs args){
rewarded = true;
}
then, into the void start write these:
OnAdClosed += method1
OnAdRewarded += method2

and next, into the void update write these
if(adclose== true){
// Event when ad closed...
adclose = false;
}
if(rewarded == true){
// Events when ad finish. Ex : coin += 10...
rewarded = false;
}
thats it. Sorry for my bad england.