add to cart c:

lib/bigcommerce/api/utils/create-api-handler.ts

@@ -1,12 +1,17 @@
 import type { NextApiHandler, NextApiRequest, NextApiResponse } from 'next'
 import { BigcommerceConfig, getConfig } from '..'
 
-export type BigcommerceApiHandler = (
+export type BigcommerceApiHandler<T = any> = (
   req: NextApiRequest,
-  res: NextApiResponse,
+  res: NextApiResponse<BigcommerceApiResponse<T>>,
   config: BigcommerceConfig
 ) => void | Promise<void>
 
+export type BigcommerceApiResponse<T> = {
+  data: T | null
+  errors?: { message: string }[]
+}
+
 export default function createApiHandler(handler: BigcommerceApiHandler) {
   return function getApiHandler({
     config,