I don't know how Shop Pay is engineered, but Shop Pay is Shopifys payment processing platform. I don't know if they're using another provider such as Stripe on

I don't know how Shop Pay is engineered, but Shop Pay is Shopifys payment processing platform. I don't know if they're using another provider such as Stripe on the backend though or if they've gone through the PCI compliants. With that said, just because you're not the one processing payments doesn't mean you're not the one holding it.