@shipengine/connect-carrier-api/src/models/pickup/shipment-identifier.ts

This is the typescript/javascript definitions for carrier api

import { Identifier } from '../identifier';

/** @description Identifier object for shiments */
export class ShipmentIdentifier {
  /** @description The carrier tracking number for this shipment */
  tracking_number?: string;
  /** @description A list of alternate identifiers that can be used to identify a shipment */
  alternate_identifiers?: Identifier[];
}