fix(order): caculate received total for pending difference (#11919)

**What**
- use the return received total to compute pending difference with return requested total

**Why**
- this would show incorrect outstanding amount when receiving a return and also, the outstanding amount after the return is received would be incorrect

packages/modules/order/src/utils/calculate-order-change.ts

@@ -246,16 +246,25 @@ export class OrderChangeProcessing {
       orderSummary.transaction_total
     )
 
-    // return requested becomes pending difference
+    // return total becomes pending difference
     for (const item of order.items ?? []) {
       const item_ = item as any
 
-      if (MathBN.gt(item_.return_requested_total, 0)) {
+      ;[
-        orderSummary.pending_difference = MathBN.sub(
+        "return_requested_total",
-          orderSummary.pending_difference,
+        "return_received_total",
-          item_.return_requested_total
+        // TODO: revisit this when we settle on which dismissed items need to be refunded
-        )
+        // "return_dismissed_total",
-      }
+      ].forEach((returnTotalKey) => {
+        const returnTotal = item_[returnTotalKey]
+
+        if (MathBN.gt(returnTotal, 0)) {
+          orderSummary.pending_difference = MathBN.sub(
+            orderSummary.pending_difference,
+            returnTotal
+          )
+        }
+      })
     }
     orderSummary.pending_difference = new BigNumber(
       orderSummary.pending_difference