Gumroad?

From personal experience working with a client on their font website, I can say that working with Gumroad is not ideal and you kind of have to hack it to work. They personally had to create a giant spreadsheet of every possible font and license combination and create each one as a “product” in Gumroad to make it work.

The resulting e-commerce technically works, but it is a total pain to deal with and maintain/update.