code: func (r Account_Shipment) GetAllCouriersByType(courierTypeKeyName *string) (resp []datatypes.Auxiliary_Shipping_Courier, err error) {
  	params := []interface{}{
  		courierTypeKeyName,
  	}
  	err = r.Session.DoRequest("SoftLayer_Account_Shipment", "getAllCouriersByType", params, &r.Options, &resp)
  	return
  }
docs: // Retrieve a list of available shipping couriers.