Open App/Common/Config.js and update the AdMob section to change the ID
You can control how the banner look like from the Components/AdMob/index.js
Remove the Interstital setting after 3 second after rendering the component (if you don't like the annoy Ads), this just for demo purpose:
Config.AdMob.isShowInterstital && setTimeout(this.showInterstital, 3000);
You can also link your Abmod config to your Firebase dashboard
Important: As the banner config should be "No refresh", otherwise it causes your performance issue on the app.
Document detail about this component: