The tracking identifiers for a shipment.
{ "$schema": "https://json-schema.org/draft/2020-12/schema", "$id": "#/components/schemas/tracker_identifier", "title": "Tracking Identifier", "type": "object", "description": "The tracking identifiers for a shipment.", "properties": { "transaction_id": { "type": "string", "description": "The PayPal transaction ID.", "minLength": 1, "maxLength": 50, "pattern": "^[a-zA-Z0-9]*$" }, "tracking_number": { "type": "string", "description": "The tracking number for the shipment.", "minLength": 1, "maxLength": 64 }, "links": { "type": "array", "description": "An array of request-related [HATEOAS links](/docs/api/reference/api-responses/#hateoas-links).", "readOnly": true, "items": { "$ref": "#/components/schemas/link_description", "readOnly": true } } }, "required": [ "transaction_id" ] }