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

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Remove the Interstital setting after 3 second after rendering the component (if you don't like the annoy Ads), this just for demo purpose:

componentDidMount() {         
	Config.AdMob.isShowInterstital && setTimeout(this.showInterstital, 3000);  
}

You can also link your Abmod config to your Firebase dashboard

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Important: As the banner config should be "No refresh", otherwise it causes your performance issue on the app.

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Document detail about this component: