feat: Add payment collection creation for cart (#6527)

packages/medusa/src/api-v2/store/carts/[id]/payment-collections/route.ts

@@ -0,0 +1,50 @@
+import { createPaymentCollectionForCartWorkflow } from "@medusajs/core-flows"
+import { UpdateCartDataDTO } from "@medusajs/types"
+import { remoteQueryObjectFromString } from "@medusajs/utils"
+
+import { MedusaRequest, MedusaResponse } from "../../../../../types/routing"
+import { defaultStoreCartFields } from "../../query-config"
+
+export const POST = async (
+  req: MedusaRequest<UpdateCartDataDTO>,
+  res: MedusaResponse
+) => {
+  const workflow = createPaymentCollectionForCartWorkflow(req.scope)
+
+  const remoteQuery = req.scope.resolve("remoteQuery")
+
+  let [cart] = await remoteQuery(
+    {
+      cart: {
+        fields: ["id", "currency_code", "region_id", "total"],
+      },
+    },
+    {
+      cart: { id: req.params.id },
+    }
+  )
+
+  const { errors } = await workflow.run({
+    input: {
+      cart_id: req.params.id,
+      region_id: cart.region_id,
+      currency_code: cart.currency_code,
+      amount: cart.total ?? 0, // TODO: This should be calculated from the cart when totals decoration is introduced
+    },
+    throwOnError: false,
+  })
+
+  if (Array.isArray(errors) && errors[0]) {
+    throw errors[0].error
+  }
+
+  const query = remoteQueryObjectFromString({
+    entryPoint: "cart",
+    variables: { id: req.params.id },
+    fields: defaultStoreCartFields,
+  })
+
+  ;[cart] = await remoteQuery(query)
+
+  res.status(200).json({ cart })
+}

packages/medusa/src/api-v2/store/carts/query-config.ts

@@ -42,6 +42,11 @@ export const defaultStoreCartFields = [
   "region.name",
   "region.currency_code",
   "sales_channel_id",
+
+  // TODO: To be updated when payment sessions are introduces in the Rest API
+  "payment_collection.id",
+  "payment_collection.amount",
+  "payment_collection.payment_sessions",
 ]
 
 export const defaultStoreCartRelations = [