For discussing the development and usage of Checkout UI extensions, post-purchase extensions, web pixels, Customer Accounts UI extensions, and POS UI extensions
I know Shopify automatically defaults to the cheapest shipping option, but can I use checkout extensions/functions to choose which one to default to?
Yes you can, using shipping modification function you can do it. currently it being offered in the Checkout Catalyst application without hassel and easy setup. let me know if you need demo. https://apps.shopify.com/checkout-catalyst