Wondering if there is a way to pull shipping charges through from Shopify into Google Merchant Centre without having to replicate and manually data enter? We currently have custom shipping set up and will be moving to carrier calculated shipping very soon.
If you have the shipping details natively in Shopify, meaning not in a 3rd party app, then the free Google Shopping app sends this info automatically. Make sure to enable automatic updates in the app settings under shipping.
If that does not work, then the shipping settings are most likely not native.