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You can try this Unity-Admob-Plugin ,It support ios and android with the same code
Have you try this
following this plugin document
This Admob Unity Plugin version is with google sdk 8
Admob not have reward ad
You need add frameworks of all in this list https://github.com/unity-plugins/Unity-Admob#important-tips
admob not need this meta you can read this document https://github.com/unity-plugins/Unity-Admob
I successfully has ads working via admob following Unity-Admob-Plugin