I had been working on an integration between our product and Shopify via an app for just about a week when their updated ToU came out. It is a pain in the butt. I side with MailChimp here, that customer data isn't ours to share with Shopify, especially since it concerns a whole different segment of our merchants' customers (brick and mortar vs ecommerce).

What's not mentioned here is that they also updated the terms to prohibit selling anything on behalf of a merchant without using their checkout api, if your software is integrated with Shopify. But we make a special-purpose POS, that's our value-add. It appears that they just want their cut - of customer data and of fees.

Edit: a link to the ToU discussion on the Shopify forums. https://community.shopify.com/c/Shopify-APIs-SDKs/We-ve-upda...