fix(payment): correct Stripe price calculation and webhook host

This commit addresses two critical issues related to payment processing:

1. Correct Stripe Price Calculation:
   Previously, the unit_amount sent to Stripe used the total line item price
   (order_item.price) instead of the individual product price (product.price).
   This caused Stripe to multiply the price by quantity again, inflating the final
   amount. The logic now correctly uses item.product.price as unit_amount.

2. Fix Webhook Host Configuration:
   Stripe webhooks were failing due to a DisallowedHost error because the container
   hostname ('web') was not listed in ALLOWED_HOSTS in the production settings.
   'web' has now been added to the list in prod.py.

Author: Yosef-AlSabbah

ecommerce_api/settings/prod.py

@@ -6,7 +6,7 @@
     ('Yousef Y', '[email protected]'),
 ]
 
-ALLOWED_HOSTS = ['eCommerce.com', 'www.eCommerce.com']
+ALLOWED_HOSTS = ['eCommerce.com', 'www.eCommerce.com', 'web']
 
 REDIS_URL = 'redis://cache:6379'
 CACHES['default']['LOCATION'] = REDIS_URL

payment/views.py

@@ -95,7 +95,7 @@ def post(self, request, *args, **kwargs):
                 session_data["line_items"].append(
                     {
                         "price_data": {
-                            "unit_amount": int(item.price * Decimal('10')),  # Convert price to cents
+                            "unit_amount": int(item.product.price * Decimal('100')),  # Convert price to cents
                             "currency": "usd",
                             "product_data": {
                                 "name": item.product.name,  # Use the product name