Currently, Recurly does not offer a formal integration path with ClickFunnels.
Our API which you can learn more about here as well as, Recurly.js are flexible enough to connect with just about any checkout carts/forms. Our recommendation is to look into those that will fit your business needs. We also offer our Purchase API endpoint, which can form a multi-product checkout experience. In addition to that, we have our Hosted Payment Pages which offers a basic checkout process for your clients.