Activating the API Google Pay

To enable the Google Pay™ API and use it in your project, you have to add the following to the <application> tag of the AndroidManifest.xml file:
<application>
	...
	<!-- Enables the Google Pay API -->
	<meta-data
		android:name="com.google.android.gms.wallet.api.enabled"
		android:value="true" />
</application>