code: func (r Network_Interconnect_Tenant) GetBillingItem() (resp datatypes.Billing_Item_Network_Interconnect, err error) {
  	err = r.Session.DoRequest("SoftLayer_Network_Interconnect_Tenant", "getBillingItem", nil, &r.Options, &resp)
  	return
  }
docs: // Retrieve The active billing item for a network interconnect.