Need to add Apps in unity account and integrate chartboost SDK

Hi Everyone,
I hope you're well!

I'm Anil Krishna. I'm a buyer on flippa website and bought 5 new apps. I want to use chartboost as my advertising network and I have a total of 5 Apps source code, which is created from the unity platform only.
My seller shared the whole source code and I want the chartboost ads to serve in my apps.

I want you to add all the apps in my unity account and integrate the SDK file of chartboost and make the chartboost ads serving in my apps.

I really don't have an idea of where to integrate the chartboost SDK file.
Please help me with this and teach me how to do this in future if I purchase a new app.

Waiting for your reply!

Thanks,
Anil