This is actually closer to my original plan than Stripe. Click "Buy now" at https://www.shopify.com/buy-button https://www.shopify.com/buy-button and it does ex

This is actually closer to my original plan than Stripe. Click "Buy now" at https://www.shopify.com/buy-button https://www.shopify.com/buy-button and it does exactly what I need. Documentation at http://shopify.github.io/js-buy-sdk/examples/ http://shopify.github.io/js-buy-sdk/examples/. Pricing is different than Stripe but within reason.