I answered my own question. Setting values with customAttributes via JS Buy allows you to read them as properties in the shopify scripts API. JS Buy SDK:{ variantId: item.variantId, quantity: item.quantity, customAttributes: [ { ...

I can read properties via a Shopify Script.And I can set customAttributes via the JS Buy SDK.But I can't figure out how to get the script to read the customAttributes or how to get the JS Buy SDK to write properties.Can someone point me in the right ...