well not quite anyone... you need to be approved to be able to use the sales-channel-sdk.
To date I haven't been approved, which is one of the reasons why after 10+ years of using shopify we're moving off the platform. Biggest reason is limited API calls even on the Shopify Enterprise Plan...
Shopify is a great option if you've got a few skus, e.g. want to sell a few T-Shirts, however try to do anything complicated (like merging customer accounts, editing orders etc, even changing a billing address of an order) and it falls over :(