Issue: A rate-quoting app calculates shipping, duties, and taxes at checkout, but the data Shopify sends to the app excludes any applied discount codes and contains only full item prices.
Impact: Duties and taxes are computed on higher pre-discount values, causing overestimation relative to what the buyer actually pays.
Need: Access to discounted item prices (discount-adjusted values) in the payload used to request rates, so duties/taxes can be calculated accurately in real time.
Status: Unresolved; the poster is requesting guidance or API support to receive discounted prices during the checkout rating call.
We have an app that returns shipping cost and duties/taxes real time during checkout. However, we observed that details we receive from Shopify to quote rates does not include discounted price.
The buyer is applying a discount code at checkout, still Shopify sends actual item price while hitting our app for rates. This is resulting in calculating duties/taxes on higher price than the actual price paid by the buyer.
We need discount price details to quote duties/taxes correctly.