feat: Add exchange return shipping (#8108)

* wip

* finalize tests

* feat: Add exchange return shipping

* add shipping to preview

* test input

* move utils and ignore already inserted shipping method

* use custom price

---------

Co-authored-by: Carlos R. L. Rodrigues <rodrigolr@gmail.com>

packages/modules/order/src/utils/actions/shipping-add.ts

@@ -17,7 +17,7 @@ OrderChangeProcessing.registerActionType(ChangeActionType.SHIPPING_ADD, {
         return_id: action.return_id,
         claim_id: action.claim_id,
         exchange_id: action.exchange_id,
-        price: action.amount as number,
+        amount: action.amount as number,
       }
       shipping.push(existing)
     }

packages/modules/order/src/utils/actions/shipping-remove.ts

@@ -33,7 +33,7 @@ OrderChangeProcessing.registerActionType(ChangeActionType.SHIPPING_REMOVE, {
         return_id: action.return_id,
         claim_id: action.claim_id,
         exchange_id: action.exchange_id,
-        price: action.amount as number,
+        amount: action.amount as number,
       })
     }
   },

packages/modules/order/src/utils/apply-order-changes.ts

@@ -1,5 +1,9 @@
 import { OrderChangeActionDTO } from "@medusajs/types"
-import { createRawPropertiesFromBigNumber } from "@medusajs/utils"
+import {
+  ChangeActionType,
+  createRawPropertiesFromBigNumber,
+  isDefined,
+} from "@medusajs/utils"
 import { OrderItem, OrderShippingMethod } from "@models"
 import { calculateOrderChange } from "./calculate-order-change"
 
@@ -35,7 +39,7 @@ export function applyChangesToOrder(
 
     calculatedOrders[order.id] = calculated
 
-    const version = actionsMap[order.id][0].version ?? 1
+    const version = actionsMap[order.id]?.[0]?.version ?? order.version
 
     for (const item of calculated.order.items) {
       const isExistingItem = item.id === item.detail?.item_id
@@ -68,17 +72,36 @@ export function applyChangesToOrder(
 
     if (version > order.version) {
       for (const shippingMethod of calculated.order.shipping_methods ?? []) {
-        if (!shippingMethod) {
+        const shippingMethod_ = shippingMethod as any
+        const isNewShippingMethod = !isDefined(shippingMethod_?.detail)
+        if (!shippingMethod_) {
           continue
         }
 
-        const sm = {
-          ...((shippingMethod as any).detail ?? shippingMethod),
-          version,
+        let associatedMethodId
+        let hasShippingMethod = false
+        if (isNewShippingMethod) {
+          associatedMethodId = shippingMethod_.actions?.find((sm) => {
+            return (
+              sm.action === ChangeActionType.SHIPPING_ADD && sm.reference_id
+            )
+          })
+          hasShippingMethod = !!associatedMethodId
+        } else {
+          associatedMethodId = shippingMethod_?.detail?.shipping_method_id
         }
 
+        const sm = {
+          ...(isNewShippingMethod ? shippingMethod_ : shippingMethod_.detail),
+          version,
+          shipping_method_id: associatedMethodId,
+        } as any
+
         delete sm.id
-        shippingMethodsToUpsert.push(sm)
+
+        if (!hasShippingMethod) {
+          shippingMethodsToUpsert.push(sm)
+        }
       }
 
       orderToUpdate.push({