I have successfully implemented AdMob's test ads for rewarded videos. However, I saw on other sites that we have to sign up to third-party sites to get rewarded videos, and we get paid by those sites directly. But I'm not so sure about that because AdMob's documentation on rewarded video ads (seemed to) mentioned nothing about third-party sites.
So do we have to sign up to third-party sites to get the real video ads? What will happen if I simply just replace the test-ad id with the real ad-unit id on AdMob, and do nothing else?
Currently admob delivers rewarded ads so you do not have to get them from third-parties.