diff --git a/lib/medusa/index.ts b/lib/medusa/index.ts
index f97b789b5..007898710 100644
--- a/lib/medusa/index.ts
+++ b/lib/medusa/index.ts
@@ -70,10 +70,7 @@ const reshapeCart = (cart: MedusaCart): Cart => {
   const currencyCode = 'EUR';
   const cost = {
     subtotalAmount: {
-      amount:
-        (cart?.tax_total && cart?.total && (cart?.total - cart?.tax_total).toString()) ||
-        cart?.total?.toString() ||
-        '0',
+      amount: cart?.subtotal?.toString() || '0',
       currencyCode: currencyCode
     },
     totalAmount: {
diff --git a/lib/medusa/types.ts b/lib/medusa/types.ts
index 315c970db..697fc6a37 100644
--- a/lib/medusa/types.ts
+++ b/lib/medusa/types.ts
@@ -338,6 +338,7 @@ export type MedusaCart = {
   tax_total?: number;
   refunded_total?: number;
   total?: number;
+  subtotal?: number;
 };
 
 export type Cart = Partial<MedusaCart> & {