saleor: initial cart integration

framework/saleor/utils/get-checkout-id.ts

@@ -1,5 +1,9 @@
+import Cookies from 'js-cookie'
+import { CHECKOUT_ID_COOKIE } from '../const'
+
 const getCheckoutId = (id?: string) => {
-  return id
+  const r = Cookies.get(CHECKOUT_ID_COOKIE)?.split(":") || [];
+  return { checkoutId: r[0], checkoutToken: r[1] }
 }
 
 export default getCheckoutId