Depending on the type of product you are selling, something like gumroad may be ...

		chamakits on Aug 2, 2017 \| parent \| context \| favorite \| on: Ask HN: How to sell your app/side project while wo... Depending on the type of product you are selling, something like gumroad may be a good fit for you. https://gumroad.com They have an api as well, but I've seen most people use their landing page/buy product page more than anything.