diff --git a/framework/bigcommerce/cart/use-add-item.tsx b/framework/bigcommerce/cart/use-add-item.tsx
index d74c23567..525fa98a3 100644
--- a/framework/bigcommerce/cart/use-add-item.tsx
+++ b/framework/bigcommerce/cart/use-add-item.tsx
@@ -3,17 +3,13 @@ import type { MutationHook } from '@commerce/utils/types'
 import { CommerceError } from '@commerce/utils/errors'
 import useAddItem, { UseAddItem } from '@commerce/cart/use-add-item'
 import { normalizeCart } from '../lib/normalize'
-import type {
-  Cart,
-  BigcommerceCart,
-  CartItemBody,
-  AddCartItemBody,
-} from '../types'
+import type { BigcommerceCart, AddItemHook } from '../types/cart'
 import useCart from './use-cart'
 
 export default useAddItem as UseAddItem<typeof handler>
 
-export const handler: MutationHook<Cart, {}, CartItemBody> = {
+// export const handler: MutationHook<Cart, {}, CartItemBody> = {
+export const handler: MutationHook<AddItemHook> = {
   fetchOptions: {
     url: '/api/bigcommerce/cart',
     method: 'POST',
@@ -28,7 +24,7 @@ export const handler: MutationHook<Cart, {}, CartItemBody> = {
       })
     }
 
-    const data = await fetch<BigcommerceCart, AddCartItemBody>({
+    const data = await fetch<BigcommerceCart>({
       ...options,
       body: { item },
     })
diff --git a/framework/bigcommerce/types/cart.ts b/framework/bigcommerce/types/cart.ts
index da2f13da9..d73c5b7e4 100644
--- a/framework/bigcommerce/types/cart.ts
+++ b/framework/bigcommerce/types/cart.ts
@@ -45,7 +45,13 @@ export type CartItemBody = Core.CartItemBody & {
 
 export type CartHooks = Core.CartHooks & {
   getCart: { data: Cart | null }
-  addItem: { data: Cart; body: { item: CartItemBody } }
+  addItem: {
+    data: Cart
+    body: { item: CartItemBody }
+    input: CartItemBody
+    fetchInput: CartItemBody
+    actionInput: CartItemBody
+  }
   updateItem: { data: Cart; body: { item: CartItemBody } }
   removeItem: { data: Cart | null }
 }
diff --git a/framework/commerce/cart/use-add-item.tsx b/framework/commerce/cart/use-add-item.tsx
index 072e68674..ab95979fc 100644
--- a/framework/commerce/cart/use-add-item.tsx
+++ b/framework/commerce/cart/use-add-item.tsx
@@ -5,7 +5,7 @@ import type { AddItemHook } from '../types/cart'
 import type { Provider } from '..'
 
 export type UseAddItem<
-  H extends MutationHook<AddItemHook> = MutationHook<AddItemHook>
+  H extends MutationHook<any> = MutationHook<AddItemHook>
 > = ReturnType<H['useHook']>
 
 export const fetcher: HookFetcherFn<AddItemHook> = mutationFetcher
diff --git a/framework/commerce/types/cart.ts b/framework/commerce/types/cart.ts
index 91cd3819c..24f649b1a 100644
--- a/framework/commerce/types/cart.ts
+++ b/framework/commerce/types/cart.ts
@@ -103,7 +103,8 @@ export type AddItemHook = {
   data: Cart
   body: { item: CartItemBody }
   input: CartItemBody
-  fetchInput: { item: CartItemBody }
+  fetchInput: CartItemBody
+  actionInput: CartItemBody
 }
 
 export type UpdateItemHook = {
diff --git a/framework/commerce/utils/types.ts b/framework/commerce/utils/types.ts
index 865f7279d..9f9f8fd8a 100644
--- a/framework/commerce/utils/types.ts
+++ b/framework/commerce/utils/types.ts
@@ -39,7 +39,7 @@ export type HookFetcher<Data, Input = null, Result = any> = (
 export type HookFetcherFn<
   H extends HookSchemaBase,
   Result = any,
-  Body = any
+  Body = H['body']
 > = (
   context: HookFetcherContext<H['fetchInput'], Result, Body>
 ) => H['data'] | Promise<H['data']>
@@ -77,6 +77,8 @@ export type HookSchemaBase = {
   input: {}
   // Input expected before doing a fetch operation
   fetchInput?: {}
+  // Data expected by the fetch operation
+  body?: {}
 }
 
 export type SWRHookSchemaBase = HookSchemaBase & {
@@ -123,7 +125,7 @@ export type MutationHook<H extends MutationSchemaBase> = {
     HookFunction<H['actionInput'], H['data'] | Promise<H['data']>>
   >
   fetchOptions: HookFetcherOptions
-  fetcher?: HookFetcherFn<H['data'], H['fetchInput']>
+  fetcher?: HookFetcherFn<H>
 }
 
 export type MutationHookContext<H extends MutationSchemaBase> = {