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Version 2.0.0 introduced some breaking changes which warranted this short guide.

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1. Update AndroidManifest.xml

Before version 2.0.0 it was required to have the following metadata inside the application tag in the AndroidManifest.xml: 
<meta-data
    android:name="com.google.android.gms.ads.APPLICATION_ID"
    android:value="ca-app-pub-3940256099942544~3347511713"/>
This can now be removed. This ID will be moved in the next step.

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2. Update SDK Initialisation

Update to the new SDK configuration API which now requires the Google application ID as a parameter: 
val configuration = CIMobileAdsConfiguration.Builder(
    publisherId = "<PUBLISHER-ID>",
    googleId = "ca-app-pub-3940256099942544~3347511713" // New required parameter
)
.setDebugFeature(true)
.enableAppOpen("<PLACEMENT-ID>") // only required if using App Open ads
.build()

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3. Interstitial ads

If your application uses Interstitial ads, the CIInterstitialAd API no longer requires the context parameter, so this can be removed: 
val interstitial = CIInterstitialAd(
    placementID = "<PLACEMENT-ID>",
    eventListener = eventListener,
    pageUrl = "https://example.com/sport"
)