Improve checkout process and error handling

app.py

@@ -1,4 +1,5 @@
 import os
+import copy
 from flask import Flask, request, json, abort
 from flask_cors import CORS
 
@@ -37,14 +38,18 @@ def unhandled_exception():
 
 def process_order(cart):
     global Inventory
-    tempInventory = Inventory
+    temp_inventory = copy.deepcopy(Inventory)
     for item in cart:
-        if Inventory[item['id']] <= 0:
-            raise Exception("Not enough inventory for " + item['id'])
-        else:
-            tempInventory[item['id']] -= 1
-            print 'Success: ' + item['id'] + ' was purchased, remaining stock is ' + str(tempInventory[item['id']])
-    Inventory = tempInventory 
+        item_id = item.get('id')
+        if not item_id:
+            raise ValueError("Cart item is missing an 'id'")
+        if item_id not in temp_inventory:
+            raise ValueError(f"Item '{item_id}' not found in inventory.")
+        if temp_inventory[item_id] <= 0:
+            raise ValueError(f"Not enough inventory for {item_id}")
+        temp_inventory[item_id] -= 1
+        print(f"Success: {item_id} was purchased, remaining stock is {temp_inventory[item_id]}")
+    Inventory = temp_inventory 
 
 @app.before_request
 def sentry_event_context():
@@ -65,11 +70,17 @@ def sentry_event_context():
 
 @app.route('/checkout', methods=['POST'])
 def checkout():
-
-    order = json.loads(request.data)
-    print "Processing order for: " + order["email"]
-    cart = order["cart"]
-
-    process_order(cart)
-
-    return 'Success'
+    try:
+        order = json.loads(request.data)
+        cart = order.get("cart")
+        if cart is None:
+            raise ValueError("Missing 'cart' in request body")
+        print(f"Processing order for: {order.get('email')}")
+        process_order(cart)
+        return 'Success'
+    except (KeyError, ValueError) as e:
+        sentry_sdk.capture_exception(e)
+        abort(400, description=str(e))
+    except Exception as e:
+        sentry_sdk.capture_exception(e)
+        abort(500)