fix(core-flows,medusa): Include region_id in shipping option retrieval (#9929)

### What
Include `region_id` when retrieving shipping options for a cart

### Why
Otherwise, region-specific prices will never show in the Store API

Closes CMRC-655 https://github.com/medusajs/medusa/issues/9906

.changeset/heavy-pears-mix.md

@@ -0,0 +1,7 @@
+---
+"@medusajs/medusa": patch
+"@medusajs/core-flows": patch
+"@medusajs/types": patch
+---
+
+fix(core-flows,medusa): Include region_id in shipping option retrieval

integration-tests/modules/__tests__/shipping-options/store/shipping-options.spec.ts

@@ -1,9 +1,9 @@
+import { medusaIntegrationTestRunner } from "@medusajs/test-utils"
 import {
   IFulfillmentModuleService,
   IRegionModuleService,
 } from "@medusajs/types"
 import { ContainerRegistrationKeys, Modules } from "@medusajs/utils"
-import { medusaIntegrationTestRunner } from "@medusajs/test-utils"
 import {
   createAdminUser,
   generatePublishableKey,
@@ -25,6 +25,7 @@ medusaIntegrationTestRunner({
 
       let salesChannel
       let region
+      let regionTwo
       let product
       let stockLocation
       let shippingProfile
@@ -37,11 +38,12 @@ medusaIntegrationTestRunner({
         appContainer = getContainer()
         fulfillmentModule = appContainer.resolve(Modules.FULFILLMENT)
         regionService = appContainer.resolve(Modules.REGION)
-        const publishableKey = await generatePublishableKey(appContainer)
-        storeHeaders = generateStoreHeaders({ publishableKey })
       })
 
       beforeEach(async () => {
+        const publishableKey = await generatePublishableKey(appContainer)
+        storeHeaders = generateStoreHeaders({ publishableKey })
+
         await createAdminUser(dbConnection, adminHeaders, appContainer)
         const remoteLinkService = appContainer.resolve(
           ContainerRegistrationKeys.REMOTE_LINK
@@ -53,6 +55,22 @@ medusaIntegrationTestRunner({
           currency_code: "usd",
         })
 
+        regionTwo = await regionService.createRegions({
+          name: "Test region two",
+          countries: ["DK"],
+          currency_code: "dkk",
+        })
+
+        await api.post(
+          "/admin/price-preferences",
+          {
+            attribute: "region_id",
+            value: regionTwo.id,
+            is_tax_inclusive: true,
+          },
+          adminHeaders
+        )
+
         salesChannel = (
           await api.post(
             "/admin/sales-channels",
@@ -79,6 +97,10 @@ medusaIntegrationTestRunner({
                       currency_code: "usd",
                       amount: 100,
                     },
+                    {
+                      currency_code: "dkk",
+                      amount: 100,
+                    },
                   ],
                   options: {
                     size: "large",
@@ -91,7 +113,7 @@ medusaIntegrationTestRunner({
           )
         ).data.product
 
-        const stockLocation = (
+        stockLocation = (
           await api.post(
             `/admin/stock-locations`,
             {
@@ -112,7 +134,10 @@ medusaIntegrationTestRunner({
           service_zones: [
             {
               name: "Test",
-              geo_zones: [{ type: "country", country_code: "us" }],
+              geo_zones: [
+                { type: "country", country_code: "us" },
+                { type: "country", country_code: "dk" },
+              ],
             },
           ],
         })
@@ -165,13 +190,20 @@ medusaIntegrationTestRunner({
                   region_id: region.id,
                   amount: 1100,
                 },
+                {
+                  region_id: regionTwo.id,
+                  amount: 500,
+                },
               ],
               rules: [],
             },
             adminHeaders
           )
         ).data.shipping_option
+      })
 
+      describe("GET /store/shipping-options?cart_id=", () => {
+        it("should get shipping options for a cart successfully", async () => {
           cart = (
             await api.post(
               `/store/carts`,
@@ -190,10 +222,7 @@ medusaIntegrationTestRunner({
               storeHeaders
             )
           ).data.cart
-      })
 
-      describe("GET /admin/shipping-options?cart_id=", () => {
-        it("should get all shipping options for a cart successfully", async () => {
           const resp = await api.get(
             `/store/shipping-options?cart_id=${cart.id}`,
             storeHeaders
@@ -206,10 +235,36 @@ medusaIntegrationTestRunner({
             expect.objectContaining({
               id: shippingOption.id,
               name: "Test shipping option",
-              amount: 1000,
+              amount: 1100,
               price_type: "flat",
             })
           )
+
+          cart = (
+            await api.post(
+              `/store/carts/${cart.id}`,
+              {
+                region_id: regionTwo.id,
+              },
+              storeHeaders
+            )
+          ).data.cart
+
+          const secondResp = await api.get(
+            `/store/shipping-options?cart_id=${cart.id}`,
+            storeHeaders
+          )
+
+          expect(secondResp.data.shipping_options).toHaveLength(1)
+          expect(secondResp.data.shipping_options[0]).toEqual(
+            expect.objectContaining({
+              id: shippingOption.id,
+              name: "Test shipping option",
+              amount: 500,
+              price_type: "flat",
+              is_tax_inclusive: true,
+            })
+          )
         })
       })
     })

packages/core/core-flows/src/cart/workflows/list-shipping-options-for-cart.ts

@@ -86,6 +86,7 @@ export const listShippingOptionsForCartWorkflow = createWorkflow(
         calculated_price: {
           context: {
             currency_code: input.currency_code,
+            region_id: input.region_id,
           },
         },
       },

packages/core/types/src/cart/workflows.ts

@@ -112,6 +112,7 @@ export interface ListShippingOptionsForCartWorkflowInputDTO {
   cart_id: string
   is_return: boolean
   sales_channel_id?: string
+  region_id?: string
   currency_code: string
   shipping_address: {
     city?: string

packages/medusa/src/api/store/shipping-options/route.ts

@@ -1,7 +1,7 @@
 import { listShippingOptionsForCartWorkflow } from "@medusajs/core-flows"
+import { MedusaRequest, MedusaResponse } from "@medusajs/framework/http"
 import { HttpTypes, ICartModuleService } from "@medusajs/framework/types"
 import { MedusaError, Modules } from "@medusajs/framework/utils"
-import { MedusaRequest, MedusaResponse } from "@medusajs/framework/http"
 import { StoreGetShippingOptionsType } from "./validators"
 
 export const GET = async (
@@ -25,6 +25,7 @@ export const GET = async (
       "id",
       "sales_channel_id",
       "currency_code",
+      "region_id",
       "shipping_address.city",
       "shipping_address.country_code",
       "shipping_address.province",
@@ -37,6 +38,7 @@ export const GET = async (
       cart_id: cart.id,
       sales_channel_id: cart.sales_channel_id,
       currency_code: cart.currency_code,
+      region_id: cart.region_id,
       is_return: !!is_return,
       shipping_address: {
         city: cart.shipping_address?.city,