diff --git a/backend/requirements.txt b/backend/requirements.txt
index 6f079ac..3abb92c 100644
--- a/backend/requirements.txt
+++ b/backend/requirements.txt
@@ -16,3 +16,5 @@ alembic
 email-validator
 playwright  # PDF capture for performance check reports
 apscheduler  # Scheduled tasks (exchange rate updates)
+stripe  # Payment processing
+user-agents  # Visitor tracking