Depending on the type of product you are selling, something like gumroad may be a good fit for you. https://gumroad.com https://gumroad.com They have an api a

Depending on the type of product you are selling, something like gumroad may be a good fit for you. https://gumroad.com 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.