code: func (r Hardware_SecurityModule) GetActiveNetworkFirewallBillingItem() (resp datatypes.Billing_Item, err error) {
  	err = r.Session.DoRequest("SoftLayer_Hardware_SecurityModule", "getActiveNetworkFirewallBillingItem", nil, &r.Options, &resp)
  	return
  }
docs: // Retrieve The billing item for a server's attached network firewall.