I think you can just hack something together with nostr.
I sold a few stickers on nostr without even making a store.
Discussion
nostr:npub1eequz6v23szzyx9utphsh8kg6kll50wte6sfh4vah8gdjtplcz6qg7at9s uses nostr:npub155m2k8ml8sqn8w4dhh689vdv0t2twa8dgvkpnzfggxf4wfughjsq2cdcvg but Iβm not sure what the shopping cart is built with.
I use it on WordPress and Shopify. Luna or Voltage only solid way to go, but is more complicated and comes with a monthly expense.
BTCpayServer works great with WordPress. This tutorial is a little outdated, but it's also easier to set up with the one click method.
https://m.youtube.com/playlist?list=PL7b9Wt9shK2r-WXS6ysG4tafVQRu80biZ