private function __construct() {

		// Setup a llms add-on plugin info.
		add_filter( 'plugins_api', array( $this, 'plugins_api' ), 10, 3 );

		// Authenticate and get a real download link during add-on upgrade attempts.
		add_filter( 'upgrader_package_options', array( $this, 'upgrader_package_options' ) );

		// Add llms add-on info to list of available updates.
		add_filter( 'pre_set_site_transient_update_themes', array( $this, 'pre_set_site_transient_update_things' ) );
		add_filter( 'pre_set_site_transient_update_plugins', array( $this, 'pre_set_site_transient_update_things' ) );

		$products = llms_get_add_ons();
		if ( ! is_wp_error( $products ) && isset( $products['items'] ) ) {
			foreach ( (array) $products['items'] as $product ) {

				if ( 'plugin' === $product['type'] && $product['update_file'] ) {
					add_action( "in_plugin_update_message-{$product['update_file']}", array( $this, 'in_plugin_update_message' ), 10, 2 );
				}
			}
		}

	}