Need to fix ranking and FB connect for a unity game

I have a game that is published on playstores and I want to fix the below issues: 1- reward ads from admobs are not working we need to fix this 2- Ranking is not working, google play service is being used which is not compatible with iOS any more and we need to use another service. 3- Connection to faceboook is not working. I need someone to correct them today AND POST THE UPDATED BUILDS ON THE PLAYSTORES the code can be found here: [login to view URL]