If you’re noticing that shipping rates aren’t calculated correctly when a discount code is applied at checkout, you’re not alone, and it’s not a bug.
This happens because our script cannot run on the Shopify checkout page, due to platform limitations. As a result, manually entered discount codes at checkout won’t be recognized by our shipping script.
How to fix it
To ensure discounts are applied properly during a shipping test, make sure any discounts are automatically applied before checkout (e.g., via Shopify’s automatic discount settings or our app’s configuration). This way, the shipping script can calculate rates correctly.
