[WooCommerce Bookings]: Set custom Google client ID and secret

functions.php

<?php

/**
 * Update Google client with your own application's cliend ID and secret from the Google Developer's Console.
 */
add_action(
	'woocommerce_bookings_update_google_client',
	function ( Google_Client $client ) {
		$client->setClientId( 'YourClientIDFromGoogleDevelopersConsole' );
		$client->setClientSecret( 'YourClientIDFromGoogleDevelopersConsole' );
	}
);