Hello,
I'm an Unity3D expert with 4 years experience.
I have experience with Rewarded Videos and In-App Purchase.
Here is my last project on which I included Rewarded Video and In-App Purchase:
for iOS ~ [login to view URL]
for Android ~ [login to view URL]
Now it depends, do you want these for iOS, for Android or for both to work? After that do you need help to upload them on store or you can manage with uploading?
Best Regards,
Nechifor Marian