diff --git a/lib/bigcommerce/api/cart/handlers/add-item.ts b/lib/bigcommerce/api/cart/handlers/add-item.ts
new file mode 100644
index 000000000..f5475fb08
--- /dev/null
+++ b/lib/bigcommerce/api/cart/handlers/add-item.ts
@@ -0,0 +1,37 @@
+import parseItem from '../../utils/parse-item'
+import getCartCookie from '../../utils/get-cart-cookie'
+import type { CartHandlers } from '..'
+
+// Return current cart info
+const addItem: CartHandlers['addItem'] = async ({
+  res,
+  body: { cartId, item },
+  config,
+}) => {
+  if (!item) {
+    return res.status(400).json({
+      data: null,
+      errors: [{ message: 'Missing item' }],
+    })
+  }
+  if (!item.quantity) item.quantity = 1
+
+  const options = {
+    method: 'POST',
+    body: JSON.stringify({
+      line_items: [parseItem(item)],
+    }),
+  }
+  const { data } = cartId
+    ? await config.storeApiFetch(`/v3/carts/${cartId}/items`, options)
+    : await config.storeApiFetch('/v3/carts', options)
+
+  // Create or update the cart cookie
+  res.setHeader(
+    'Set-Cookie',
+    getCartCookie(config.cartCookie, data.id, config.cartCookieMaxAge)
+  )
+  res.status(200).json({ data })
+}
+
+export default addItem
diff --git a/lib/bigcommerce/api/cart/handlers/remove-item.ts b/lib/bigcommerce/api/cart/handlers/remove-item.ts
new file mode 100644
index 000000000..2ee5dbe16
--- /dev/null
+++ b/lib/bigcommerce/api/cart/handlers/remove-item.ts
@@ -0,0 +1,34 @@
+import getCartCookie from '../../utils/get-cart-cookie'
+import type { CartHandlers } from '..'
+
+// Return current cart info
+const removeItem: CartHandlers['removeItem'] = async ({
+  res,
+  body: { cartId, itemId },
+  config,
+}) => {
+  if (!cartId || !itemId) {
+    return res.status(400).json({
+      data: null,
+      errors: [{ message: 'Invalid request' }],
+    })
+  }
+
+  const result = await config.storeApiFetch<{ data: any } | null>(
+    `/v3/carts/${cartId}/items/${itemId}`,
+    { method: 'DELETE' }
+  )
+  const data = result?.data ?? null
+
+  res.setHeader(
+    'Set-Cookie',
+    data
+      ? // Update the cart cookie
+        getCartCookie(config.cartCookie, cartId, config.cartCookieMaxAge)
+      : // Remove the cart cookie if the cart was removed (empty items)
+        getCartCookie(config.cartCookie)
+  )
+  res.status(200).json({ data })
+}
+
+export default removeItem
diff --git a/lib/bigcommerce/api/cart/handlers/update-item.ts b/lib/bigcommerce/api/cart/handlers/update-item.ts
new file mode 100644
index 000000000..0a9fcaca7
--- /dev/null
+++ b/lib/bigcommerce/api/cart/handlers/update-item.ts
@@ -0,0 +1,36 @@
+import parseItem from '../../utils/parse-item'
+import getCartCookie from '../../utils/get-cart-cookie'
+import type { CartHandlers } from '..'
+
+// Return current cart info
+const updateItem: CartHandlers['updateItem'] = async ({
+  res,
+  body: { cartId, itemId, item },
+  config,
+}) => {
+  if (!cartId || !itemId || !item) {
+    return res.status(400).json({
+      data: null,
+      errors: [{ message: 'Invalid request' }],
+    })
+  }
+
+  const { data } = await config.storeApiFetch(
+    `/v3/carts/${cartId}/items/${itemId}`,
+    {
+      method: 'PUT',
+      body: JSON.stringify({
+        line_item: parseItem(item),
+      }),
+    }
+  )
+
+  // Update the cart cookie
+  res.setHeader(
+    'Set-Cookie',
+    getCartCookie(config.cartCookie, cartId, config.cartCookieMaxAge)
+  )
+  res.status(200).json({ data })
+}
+
+export default updateItem
diff --git a/lib/bigcommerce/api/cart/index.ts b/lib/bigcommerce/api/cart/index.ts
index 23e92dbd6..8c307dda8 100644
--- a/lib/bigcommerce/api/cart/index.ts
+++ b/lib/bigcommerce/api/cart/index.ts
@@ -1,4 +1,3 @@
-import { serialize, CookieSerializeOptions } from 'cookie'
 import isAllowedMethod from '../utils/is-allowed-method'
 import createApiHandler, {
   BigcommerceApiHandler,
@@ -6,6 +5,9 @@ import createApiHandler, {
 } from '../utils/create-api-handler'
 import { BigcommerceApiError } from '../utils/errors'
 import getCart from './handlers/get-cart'
+import addItem from './handlers/add-item'
+import updateItem from './handlers/update-item'
+import removeItem from './handlers/remove-item'
 
 type Body<T> = Partial<T> | undefined
 
@@ -44,6 +46,15 @@ export type Cart = {
 
 export type CartHandlers = {
   getCart: BigcommerceHandler<Cart, { cartId?: string }>
+  addItem: BigcommerceHandler<Cart, { cartId?: string } & Body<AddItemBody>>
+  updateItem: BigcommerceHandler<
+    Cart,
+    { cartId?: string } & Body<UpdateItemBody>
+  >
+  removeItem: BigcommerceHandler<
+    Cart,
+    { cartId?: string } & Body<RemoveItemBody>
+  >
 }
 
 const METHODS = ['GET', 'POST', 'PUT', 'DELETE']
@@ -63,97 +74,26 @@ const cartApi: BigcommerceApiHandler<Cart, CartHandlers> = async (
   try {
     // Return current cart info
     if (req.method === 'GET') {
-      return await handlers['getCart']({ req, res, config, body: { cartId } })
+      const body = { cartId }
+      return await handlers['getCart']({ req, res, config, body })
     }
 
     // Create or add an item to the cart
     if (req.method === 'POST') {
-      const { item } = (req.body as Body<AddItemBody>) ?? {}
-
-      if (!item) {
-        return res.status(400).json({
-          data: null,
-          errors: [{ message: 'Missing item' }],
-        })
-      }
-      if (!item.quantity) item.quantity = 1
-
-      const options = {
-        method: 'POST',
-        body: JSON.stringify({
-          line_items: [parseItem(item)],
-        }),
-      }
-      const { data } = cartId
-        ? await config.storeApiFetch(`/v3/carts/${cartId}/items`, options)
-        : await config.storeApiFetch('/v3/carts', options)
-
-      // Create or update the cart cookie
-      res.setHeader(
-        'Set-Cookie',
-        getCartCookie(config.cartCookie, data.id, config.cartCookieMaxAge)
-      )
-
-      return res.status(200).json({ data })
+      const body = { cartId, ...req.body }
+      return await handlers['addItem']({ req, res, config, body })
     }
 
     // Update item in cart
     if (req.method === 'PUT') {
-      const { itemId, item } = (req.body as Body<UpdateItemBody>) ?? {}
-
-      if (!cartId || !itemId || !item) {
-        return res.status(400).json({
-          data: null,
-          errors: [{ message: 'Invalid request' }],
-        })
-      }
-
-      const { data } = await config.storeApiFetch(
-        `/v3/carts/${cartId}/items/${itemId}`,
-        {
-          method: 'PUT',
-          body: JSON.stringify({
-            line_item: parseItem(item),
-          }),
-        }
-      )
-
-      // Update the cart cookie
-      res.setHeader(
-        'Set-Cookie',
-        getCartCookie(config.cartCookie, cartId, config.cartCookieMaxAge)
-      )
-
-      return res.status(200).json({ data })
+      const body = { cartId, ...req.body }
+      return await handlers['updateItem']({ req, res, config, body })
     }
 
     // Remove an item from the cart
     if (req.method === 'DELETE') {
-      const { itemId } = (req.body as Body<RemoveItemBody>) ?? {}
-
-      if (!cartId || !itemId) {
-        return res.status(400).json({
-          data: null,
-          errors: [{ message: 'Invalid request' }],
-        })
-      }
-
-      const result = await config.storeApiFetch<{ data: any } | null>(
-        `/v3/carts/${cartId}/items/${itemId}`,
-        { method: 'DELETE' }
-      )
-      const data = result?.data ?? null
-
-      res.setHeader(
-        'Set-Cookie',
-        data
-          ? // Update the cart cookie
-            getCartCookie(config.cartCookie, cartId, config.cartCookieMaxAge)
-          : // Remove the cart cookie if the cart was removed (empty items)
-            getCartCookie(config.cartCookie)
-      )
-
-      return res.status(200).json({ data })
+      const body = { cartId, ...req.body }
+      return await handlers['removeItem']({ req, res, config, body })
     }
   } catch (error) {
     console.error(error)
@@ -167,31 +107,6 @@ const cartApi: BigcommerceApiHandler<Cart, CartHandlers> = async (
   }
 }
 
-function getCartCookie(name: string, cartId?: string, maxAge?: number) {
-  const options: CookieSerializeOptions =
-    cartId && maxAge
-      ? {
-          maxAge,
-          expires: new Date(Date.now() + maxAge * 1000),
-          secure: process.env.NODE_ENV === 'production',
-          path: '/',
-          sameSite: 'lax',
-        }
-      : { maxAge: -1, path: '/' } // Removes the cookie
+export const handlers = { getCart, addItem, updateItem, removeItem }
 
-  return serialize(name, cartId || '', options)
-}
-
-const parseItem = (item: ItemBody) => ({
-  quantity: item.quantity,
-  product_id: item.productId,
-  variant_id: item.variantId,
-})
-
-const handlers = {
-  getCart,
-}
-
-const h = createApiHandler(cartApi, handlers)
-
-export default h
+export default createApiHandler(cartApi, handlers)
diff --git a/lib/bigcommerce/api/utils/parse-item.ts b/lib/bigcommerce/api/utils/parse-item.ts
new file mode 100644
index 000000000..02c27bea8
--- /dev/null
+++ b/lib/bigcommerce/api/utils/parse-item.ts
@@ -0,0 +1,9 @@
+import type { ItemBody } from '../cart'
+
+const parseItem = (item: ItemBody) => ({
+  quantity: item.quantity,
+  product_id: item.productId,
+  variant_id: item.variantId,
+})
+
+export default parseItem