From ee0ff425bbc682ec430e2fe72ca5131709dbb27f Mon Sep 17 00:00:00 2001
From: Alexander Saiannyi <alexander.saiannyi@bigcommerce.com>
Date: Mon, 4 May 2026 21:29:04 +0200
Subject: [PATCH] fix(core): TRAC-294 show manual checkout discounts in cart
 summary

---
 .changeset/cold-foxes-lie.md                  |  5 +++++
 core/app/[locale]/(default)/cart/page-data.ts |  8 ++++++++
 core/app/[locale]/(default)/cart/page.tsx     | 11 +++++++++--
 3 files changed, 22 insertions(+), 2 deletions(-)
 create mode 100644 .changeset/cold-foxes-lie.md

diff --git a/.changeset/cold-foxes-lie.md b/.changeset/cold-foxes-lie.md
new file mode 100644
index 0000000000..5a2cef8780
--- /dev/null
+++ b/.changeset/cold-foxes-lie.md
@@ -0,0 +1,5 @@
+---
+"@bigcommerce/catalyst-core": patch
+---
+
+Fix cart summary Discounts row not showing manual discounts applied via the Management Checkout API
diff --git a/core/app/[locale]/(default)/cart/page-data.ts b/core/app/[locale]/(default)/cart/page-data.ts
index c6e47636dc..1d88b721e9 100644
--- a/core/app/[locale]/(default)/cart/page-data.ts
+++ b/core/app/[locale]/(default)/cart/page-data.ts
@@ -28,6 +28,10 @@ export const PhysicalItemFragment = graphql(`
       currencyCode
       value
     }
+    discountedAmount {
+      currencyCode
+      value
+    }
     selectedOptions {
       __typename
       entityId
@@ -87,6 +91,10 @@ export const DigitalItemFragment = graphql(`
       currencyCode
       value
     }
+    discountedAmount {
+      currencyCode
+      value
+    }
     selectedOptions {
       __typename
       entityId
diff --git a/core/app/[locale]/(default)/cart/page.tsx b/core/app/[locale]/(default)/cart/page.tsx
index bc07f3d473..29f91be420 100644
--- a/core/app/[locale]/(default)/cart/page.tsx
+++ b/core/app/[locale]/(default)/cart/page.tsx
@@ -213,6 +213,13 @@ export default async function Cart({ params }: Props) {
   const totalCouponDiscount =
     checkout?.coupons.reduce((sum, coupon) => sum + coupon.discountedAmount.value, 0) ?? 0;
 
+  const totalLineItemDiscount = [
+    ...cart.lineItems.physicalItems,
+    ...cart.lineItems.digitalItems,
+  ].reduce((sum, item) => sum + item.discountedAmount.value, 0);
+
+  const totalDiscount = cart.discountedAmount.value + totalLineItemDiscount;
+
   const giftCertificatesSummary =
     checkout?.giftCertificates.reduce<Array<{ code: string; used: number }>>((acc, c) => {
       acc.push({
@@ -278,10 +285,10 @@ export default async function Cart({ params }: Props) {
                   currency: cart.currencyCode,
                 }),
               },
-              cart.discountedAmount.value > 0
+              totalDiscount > 0
                 ? {
                     label: t('CheckoutSummary.discounts'),
-                    value: `-${format.number(cart.discountedAmount.value, {
+                    value: `-${format.number(totalDiscount, {
                       style: 'currency',
                       currency: cart.currencyCode,
                     })}`,