If you are testing rates at checkout, and you add a new rate to the app, you may need to bust the shipping cache to tell Shopify to pull in new rates. 

Shopify employs a shipping cache. This means that when rates are retrieved for the specific combination of Products in Cart & Shipping Address, Shopify will cache the returned rates on their servers for a day or so. If the exact same combination of products/address is tried again, any changes that have been made to shipping rates will not show.

When testing, it's common to run a checkout, change some rates, and simply refresh the checkout. This will now show the new rates!

How to bust the cache

  • Increment the street number of the address each time you test a rate. 
  • Try a completely different address
  • Add different products to the cart

Read more about busting the shipping cache

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