diff --git a/packages/core/core-flows/src/definition/cart/workflows/create-carts.ts b/packages/core/core-flows/src/definition/cart/workflows/create-carts.ts
index b13a8e97a3..03344fb7b3 100644
--- a/packages/core/core-flows/src/definition/cart/workflows/create-carts.ts
+++ b/packages/core/core-flows/src/definition/cart/workflows/create-carts.ts
@@ -1,8 +1,13 @@
-import { CartDTO, CreateCartWorkflowInputDTO } from "@medusajs/types"
+import {
+  AdditionalData,
+  CartDTO,
+  CreateCartWorkflowInputDTO,
+} from "@medusajs/types"
 import { MedusaError } from "@medusajs/utils"
 import {
   WorkflowData,
   WorkflowResponse,
+  createHook,
   createWorkflow,
   parallelize,
   transform,
@@ -29,9 +34,7 @@ import { refreshPaymentCollectionForCartWorkflow } from "./refresh-payment-colle
 export const createCartWorkflowId = "create-cart"
 export const createCartWorkflow = createWorkflow(
   createCartWorkflowId,
-  (
-    input: WorkflowData<CreateCartWorkflowInputDTO>
-  ): WorkflowResponse<CartDTO> => {
+  (input: WorkflowData<CreateCartWorkflowInputDTO & AdditionalData>) => {
     const variantIds = transform({ input }, (data) => {
       return (data.input.items ?? []).map((i) => i.variant_id)
     })
@@ -158,6 +161,13 @@ export const createCartWorkflow = createWorkflow(
       },
     })
 
-    return new WorkflowResponse(cart)
+    const cartCreated = createHook("cartCreated", {
+      cart,
+      additional_data: input.additional_data,
+    })
+
+    return new WorkflowResponse(cart, {
+      hooks: [cartCreated],
+    })
   }
 )
diff --git a/packages/core/core-flows/src/definition/cart/workflows/update-cart.ts b/packages/core/core-flows/src/definition/cart/workflows/update-cart.ts
index ff922c4f7b..8b81183a07 100644
--- a/packages/core/core-flows/src/definition/cart/workflows/update-cart.ts
+++ b/packages/core/core-flows/src/definition/cart/workflows/update-cart.ts
@@ -1,7 +1,9 @@
-import { UpdateCartWorkflowInputDTO } from "@medusajs/types"
+import { AdditionalData, UpdateCartWorkflowInputDTO } from "@medusajs/types"
 import { MedusaError, PromotionActions, isPresent } from "@medusajs/utils"
 import {
   WorkflowData,
+  WorkflowResponse,
+  createHook,
   createWorkflow,
   parallelize,
   transform,
@@ -22,7 +24,7 @@ import { refreshPaymentCollectionForCartWorkflow } from "./refresh-payment-colle
 export const updateCartWorkflowId = "update-cart"
 export const updateCartWorkflow = createWorkflow(
   updateCartWorkflowId,
-  (input: WorkflowData<UpdateCartWorkflowInputDTO>): WorkflowData<void> => {
+  (input: WorkflowData<UpdateCartWorkflowInputDTO & AdditionalData>) => {
     const [salesChannel, region, customerData] = parallelize(
       findSalesChannelStep({
         salesChannelId: input.sales_channel_id,
@@ -96,5 +98,14 @@ export const updateCartWorkflow = createWorkflow(
         cart_id: input.id,
       },
     })
+
+    const cartUpdated = createHook("cartUpdated", {
+      cart,
+      additional_data: input.additional_data,
+    })
+
+    return new WorkflowResponse(void 0, {
+      hooks: [cartUpdated],
+    })
   }
 )
diff --git a/packages/medusa/src/api/store/carts/[id]/route.ts b/packages/medusa/src/api/store/carts/[id]/route.ts
index 56e79b2fae..e74184558b 100644
--- a/packages/medusa/src/api/store/carts/[id]/route.ts
+++ b/packages/medusa/src/api/store/carts/[id]/route.ts
@@ -1,5 +1,5 @@
 import { updateCartWorkflow } from "@medusajs/core-flows"
-import { UpdateCartDataDTO } from "@medusajs/types"
+import { AdditionalData, UpdateCartDataDTO } from "@medusajs/types"
 
 import { MedusaRequest, MedusaResponse } from "../../../../types/routing"
 import { refetchCart } from "../helpers"
@@ -15,14 +15,14 @@ export const GET = async (req: MedusaRequest, res: MedusaResponse) => {
 }
 
 export const POST = async (
-  req: MedusaRequest<UpdateCartDataDTO>,
+  req: MedusaRequest<UpdateCartDataDTO & AdditionalData>,
   res: MedusaResponse
 ) => {
   const workflow = updateCartWorkflow(req.scope)
 
   await workflow.run({
     input: {
-      ...(req.validatedBody as UpdateCartDataDTO),
+      ...req.validatedBody,
       id: req.params.id,
     },
   })
diff --git a/packages/medusa/src/api/store/carts/route.ts b/packages/medusa/src/api/store/carts/route.ts
index e09fcc230f..714da3cbbc 100644
--- a/packages/medusa/src/api/store/carts/route.ts
+++ b/packages/medusa/src/api/store/carts/route.ts
@@ -1,5 +1,5 @@
 import { createCartWorkflow } from "@medusajs/core-flows"
-import { CreateCartWorkflowInputDTO } from "@medusajs/types"
+import { AdditionalData, CreateCartWorkflowInputDTO } from "@medusajs/types"
 import {
   AuthenticatedMedusaRequest,
   MedusaResponse,
@@ -7,7 +7,7 @@ import {
 import { refetchCart } from "./helpers"
 
 export const POST = async (
-  req: AuthenticatedMedusaRequest<CreateCartWorkflowInputDTO>,
+  req: AuthenticatedMedusaRequest<CreateCartWorkflowInputDTO & AdditionalData>,
   res: MedusaResponse
 ) => {
   const workflowInput = {
diff --git a/packages/medusa/src/api/store/carts/validators.ts b/packages/medusa/src/api/store/carts/validators.ts
index 0e62ef061a..953d20a9b3 100644
--- a/packages/medusa/src/api/store/carts/validators.ts
+++ b/packages/medusa/src/api/store/carts/validators.ts
@@ -1,6 +1,6 @@
 import { z } from "zod"
 import { AddressPayload } from "../../utils/common-validators"
-import { createSelectParams } from "../../utils/validators"
+import { createSelectParams, WithAdditionalData } from "../../utils/validators"
 
 export type StoreGetPromotionType = z.infer<typeof StoreGetCartsCart>
 export const StoreGetCartsCart = createSelectParams()
@@ -11,8 +11,8 @@ const ItemSchema = z.object({
   metadata: z.record(z.unknown()).nullish(),
 })
 
-export type StoreCreateCartType = z.infer<typeof StoreCreateCart>
-export const StoreCreateCart = z
+export type StoreCreateCartType = z.infer<typeof CreateCart>
+export const CreateCart = z
   .object({
     region_id: z.string().nullish(),
     shipping_address: z.union([AddressPayload, z.string()]).optional(),
@@ -24,6 +24,7 @@ export const StoreCreateCart = z
     metadata: z.record(z.unknown()).nullish(),
   })
   .strict()
+export const StoreCreateCart = WithAdditionalData(CreateCart)
 
 export type StoreAddCartPromotionsType = z.infer<typeof StoreAddCartPromotions>
 export const StoreAddCartPromotions = z
@@ -41,8 +42,8 @@ export const StoreRemoveCartPromotions = z
   })
   .strict()
 
-export type StoreUpdateCartType = z.infer<typeof StoreUpdateCart>
-export const StoreUpdateCart = z
+export type StoreUpdateCartType = z.infer<typeof UpdateCart>
+export const UpdateCart = z
   .object({
     region_id: z.string().nullish(),
     email: z.string().email().nullish(),
@@ -53,6 +54,7 @@ export const StoreUpdateCart = z
     promo_codes: z.array(z.string()).optional(),
   })
   .strict()
+export const StoreUpdateCart = WithAdditionalData(UpdateCart)
 
 export type StoreCalculateCartTaxesType = z.infer<
   typeof StoreCalculateCartTaxes
diff --git a/packages/medusa/src/api/utils/validators.ts b/packages/medusa/src/api/utils/validators.ts
index 9aa72771a2..82f9ed0f8f 100644
--- a/packages/medusa/src/api/utils/validators.ts
+++ b/packages/medusa/src/api/utils/validators.ts
@@ -1,4 +1,21 @@
-import { z } from "zod"
+import { z, ZodObject } from "zod"
+
+/**
+ * Wraps the original schema to a function to accept and merge
+ * additional_data schema
+ */
+export const WithAdditionalData = (originalSchema: ZodObject<any, any>) => {
+  return (additionalDataValidator?: ZodObject<any, any>) => {
+    if (!additionalDataValidator) {
+      return originalSchema.extend({
+        additional_data: z.record(z.unknown()).nullish(),
+      })
+    }
+    return originalSchema.extend({
+      additional_data: additionalDataValidator,
+    })
+  }
+}
 
 export const createBatchBody = (
   createValidator: z.ZodType,