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add_action( 'init', 'gmaps_api_acf', 100 );
function gmaps_api_acf() {
	global $mk_options;
	
	if(isset($mk_options['google_maps_api_key']) && !empty($mk_options['google_maps_api_key'])) {
		add_filter('acf/settings/google_api_key', function () {
			return $mk_options['google_maps_api_key'];
		});
	}
}