/// <summary>
/// Get all shipment events
/// </summary>
/// <param name="trackingNumber">The tracking number to track</param>
/// <param name="shipment">Shipment; pass null if the tracking number is not associated with a specific shipment</param>
/// <returns>
/// A task that represents the asynchronous operation
/// The task result contains the list of shipment events
/// </returns>
public async Task <IList <ShipmentStatusEvent> > GetShipmentEventsAsync(string trackingNumber, Shipment shipment = null)
{
var result = new List <ShipmentStatusEvent>();
if (string.IsNullOrEmpty(trackingNumber))
{
return(result);
}
result.AddRange(await _upsService.GetShipmentEventsAsync(trackingNumber));
return(result);
}
