Comments, appointments adjustments, fixed some issues

web/lib/cartApi.js

@@ -1,5 +1,7 @@
+//Base path for all cart API calls
 const BASE = "/api/v1/cart";
 
+//Returns the standard headers needed for authenticated requests
 function authHeaders(token) {
   return {
     "Content-Type": "application/json",
@@ -7,6 +9,7 @@ function authHeaders(token) {
   };
 }
 
+//Parses the response and throws an error if the request failed
 async function handleResponse(res) {
   if (res.status === 204) return null;
   const data = await res.json();