I'll put Snipcart (https://snipcart.com/ https://snipcart.com/) in the ring. It's nice because it has only the server logic part in the cloud but it's very easy

I'll put Snipcart (https://snipcart.com/ https://snipcart.com/) in the ring. It's nice because it has only the server logic part in the cloud but it's very easy for a programmer to set up and do themselves.