feat(stripe_client.py): use SITE_URL in callback

purchase/stripe_client.py

@@ -24,8 +24,7 @@ class StripeClient:
                         },
                     ],
                     "mode": "payment",
-                    # "success_url": f"http://{Site.objects.get_current().domain}{reverse('purchase_success')}",
+                    "success_url": f"{settings.SITE_URL}{reverse('purchase_success')}",
-                    "success_url": f"http://localhost:8000{reverse('purchase_success')}",
                 }
             )
         except Exception as e: