It is only currently possible for a shipment to be either:

  • outbound - the shipment is being sent by you from a location under your control (e.g. from you warehouse to a consumer)
  • inbound - the shipment is being sent to you from a location not necessarily under your control (e.g. from a consumer back to your warehouse)

If any other value for direction is provided, you will receive an invalid_direction error.