# description
Open Tracking Event Protocol — machine-readable conformance schema for a tracking timeline. Aligned with docs/standards/otep.md §13. Enums mirror App\Http\Helper\Input\OTEPStatusInput.

# $defs.subject.description
At least one of tracking_number / order_id / package_id MUST be present.

# $defs.source.properties.external_event_code.description
Raw source status code; MUST be set when status_code is null.