title: Modify Shopify Shipping Rates at Checkout
body: <p>Is there a possibility that we could add a custom shipping price at checkout through an API call or script?
  <a href="https://i.stack.imgur.com/d4Fdf.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/d4Fdf.png" alt="enter image description here" /></a></p>
  <p>I want to modify the price based on some rules and I can't figure out how to do it in Shopify. Any help will be highly appreciated.</p>