AdMob

Go to Developers Console and click Enable APIs and services:

Enable AdSense Management API:

Go to OAuth consent screen in the left menu and create consent screen settings, fill in Authorized domains field with devtodev.com:

Next, go to Credentials section in the left menu and create new OAuth credentials. Select Web application and copy JavaScript origin URI from devtodev settings - https://analytics.devtodev.com.

Save credentials and copy Client ID and Client Secret:

Go to AdMob settings and copy Publisher ID:

Fill you app bundle and copied fields into devtodev and enable integration: