public function download_export_file() {
		if ( isset( $_GET['action'], $_GET['nonce'] ) && wp_verify_nonce( wp_unslash( $_GET['nonce'] ), 'product-csv' ) && 'download_product_csv' === wp_unslash( $_GET['action'] ) ) { // WPCS: input var ok, sanitization ok.
			include_once WC_ABSPATH . 'includes/export/class-wc-product-csv-exporter.php';
			$exporter = new WC_Product_CSV_Exporter();

			if ( ! empty( $_GET['filename'] ) ) { // WPCS: input var ok.
				$exporter->set_filename( wp_unslash( $_GET['filename'] ) ); // WPCS: input var ok, sanitization ok.
			}

			$exporter->export();
		}
	}