Shopify Shipping Rates
To have real-time shipping rates available for our customers in check-out, shopify has everyone register with USPS web tools api. There is also an easy ship option to pull through pricing. I'm really actually surprised that shipstation hasn't done this yet. It'd be nice to have our shipping costs from shipstation reflected for our customers in checkout, either with an api or something.
We currently have a beta version of this feature, called In Cart Delivery Options, running in the US for merchants using Shopify, BigCommerce, and Magento (with a few other channels to come soon).
Please review our help article for details: https://help.shipstation.com/hc/en-us/articles/360046301731