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synch_delivery_failures

Standalone Turn.io Lua app for permanent WhatsApp delivery failures on SynCH contacts.

Behavior

  • Installs manifest-defined app resources from assets/manifest.json on install, config_changed, upgrade, and downgrade.
  • Subscribes to delivery errors 131026 and 131050.
  • Reapplies the same delivery-error subscriptions on config_changed, upgrade, and downgrade.
  • Uninstalls manifest-defined resources on uninstall before clearing delivery-error subscriptions.
  • Clears delivery-error subscriptions on uninstall.
  • Sets synch_reminders to "false" when a supported delivery error arrives for a contact that is not yet suppressed.
  • Records the first delivery-failure message ID in synch_delivery_failure_message_id.
  • Backfills synch_delivery_failure_message_id when reminders are already suppressed but delivery-failure provenance is missing.
  • Leaves the original synch_delivery_failure_message_id unchanged on later permanent failures.
  • Processes every error in a batch and returns failure if any contact update still fails after retries.
  • Accepts contact_fields_changed as a no-op, returns 404 Not found for http_request, and returns Unsupported journey event for journey_event.

Local Development

Run commands from turn_apps/synch_delivery_failures/.

make test
make build

If you do not already have a local turn-app alias, these make targets use the official Turn Lua SDK container directly.

Files

  • synch_delivery_failures.lua: event handler
  • lib/delivery_failure_handler.lua: delivery-failure class used by the root event router
  • spec/synch_delivery_failures_spec.lua: app tests
  • assets/manifest.json: app metadata and contact-field declaration
  • assets/README.md: markdown shown in the Turn UI