Landing Page with Upsell and Online Payment

Hi Everyone - My goal is to create a landing page where I would offer an eBook and then an upsell to include another digital product.  Can this be done in Squarespace with payment online?  I know Clickfunnels, Lead Pages and SamCart to name a few specialise in this, however, I was wondering if Squarespace can do this as well.

Thanks in advance.