1. API Route Fix (NotificationsController.php):
- Changed PUT to POST for /templates/:eventId/:channelId
- Frontend was using api.post() but backend only accepted PUT
- Templates can now be saved
2. Contextual Variables (EventRegistry.php):
- Added get_variables_for_event() method
- Returns category-based variables (order, customer, product, etc.)
- Merges event-specific variables from event definition
- Sorted alphabetically for easy browsing
3. API Response (NotificationsController.php):
- Template API now returns available_variables for the event
- Frontend can show only relevant variables
4. Frontend (EditTemplate.tsx):
- Removed hardcoded 50+ variable list
- Now uses template.available_variables from API
- Variables update based on selected event type
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