I've implemented a good portion of the buy SDK and it's working wonderfully. I'm however trying to implement a custom shipping component that updates the address and retrieves the amount to display to the user. I have the address updating and am expectingshippingLineto be populated however it returns as null.
The products that this is relevant to have a shipping component based on Printful. Printful likely computes the value and returns it to Shopify. The products are enabled to use shipping properly so I'd expect this to work unless there's another unrelated/uncontrollable issue.
Should it be technically possible to use Buy Button with shipping pricing returned via Printful? I have an issue opened in the npm package but I'm curious if there's an understanding of it this should work at all.