No patched version is available. No response from the vendor.
Nguyen Anh Tien discovered and reported this Cross Site Scripting (XSS) vulnerability in WordPress Afterpay Gateway for WooCommerce Plugin. This could allow a malicious actor to inject malicious scripts, such as redirects, advertisements, and other HTML payloads into your website which will be executed when guests visit your site. This vulnerability has been fixed in version 3.5.1.