diff --git a/apier/v1/apier2_it_test.go b/apier/v1/apier2_it_test.go
index 98ea074ec..dac3917e8 100644
--- a/apier/v1/apier2_it_test.go
+++ b/apier/v1/apier2_it_test.go
@@ -35,9 +35,9 @@ import (
 )
 
 var (
-	apierCfgPath     string
-	apierCfg         *config.CGRConfig
-	apierRPC         *rpc.Client
+	apierCfgPath      string
+	apierCfg          *config.CGRConfig
+	apierRPC          *rpc.Client
 	APIerSv2ConfigDIR string //run tests for specific configuration
 
 	sTestsAPIer = []func(t *testing.T){
diff --git a/apier/v1/apier_it_test.go b/apier/v1/apier_it_test.go
index f5234b907..5735c9e0d 100644
--- a/apier/v1/apier_it_test.go
+++ b/apier/v1/apier_it_test.go
@@ -59,9 +59,9 @@ README:
   * Execute remote Apis and test their replies(follow testtp scenario so we can test load in dataDb also).
 */
 var (
-	cfgPath          string
-	cfg              *config.CGRConfig
-	rater            *rpc.Client
+	cfgPath           string
+	cfg               *config.CGRConfig
+	rater             *rpc.Client
 	APIerSv1ConfigDIR string
 
 	apierTests = []func(t *testing.T){
diff --git a/apier/v2/apierv2_it_test.go b/apier/v2/apierv2_it_test.go
index 3e2218dc1..a15b2c860 100644
--- a/apier/v2/apierv2_it_test.go
+++ b/apier/v2/apierv2_it_test.go
@@ -34,10 +34,10 @@ import (
 )
 
 var (
-	apierCfgPath   string
-	apierCfg       *config.CGRConfig
-	apierRPC       *rpc.Client
-	dm             *engine.DataManager // share db connection here so we can check data we set through APIs
+	apierCfgPath    string
+	apierCfg        *config.CGRConfig
+	apierRPC        *rpc.Client
+	dm              *engine.DataManager // share db connection here so we can check data we set through APIs
 	APIerSv2ConfDIR string
 
 	sTestsv2it = []func(t *testing.T){
diff --git a/config/smconfig.go b/config/smconfig.go
index f6bb0358b..3c14b5fb0 100644
--- a/config/smconfig.go
+++ b/config/smconfig.go
@@ -236,6 +236,13 @@ func (scfg *SessionSCfg) loadFromJsonCfg(jsnCfg *SessionSJsonCfg) (err error) {
 			scfg.SessionTTLLastUsed = &sessionTTLLastUsed
 		}
 	}
+	if jsnCfg.Session_ttl_usage != nil {
+		if sessionTTLUsage, err := utils.ParseDurationWithNanosecs(*jsnCfg.Session_ttl_usage); err != nil {
+			return err
+		} else {
+			scfg.SessionTTLUsage = &sessionTTLUsage
+		}
+	}
 	if jsnCfg.Session_indexes != nil {
 		scfg.SessionIndexes = utils.StringMapFromSlice(*jsnCfg.Session_indexes)
 	}
diff --git a/engine/eventcost.go b/engine/eventcost.go
index ad56c722c..222249360 100644
--- a/engine/eventcost.go
+++ b/engine/eventcost.go
@@ -20,11 +20,15 @@ package engine
 
 import (
 	"errors"
+	"fmt"
+	"strconv"
+	"strings"
 	"time"
 
 	"github.com/cgrates/cgrates/utils"
 )
 
+// NewBareEventCost will intialize the EventCost with minimum information
 func NewBareEventCost() *EventCost {
 	return &EventCost{
 		Rating:        make(Rating),
@@ -36,6 +40,7 @@ func NewBareEventCost() *EventCost {
 	}
 }
 
+// NewEventCostFromCallCost will initilaize the EventCost from a CallCost
 func NewEventCostFromCallCost(cc *CallCost, cgrID, runID string) (ec *EventCost) {
 	ec = NewBareEventCost()
 	ec.CGRID = cgrID
@@ -169,6 +174,7 @@ func (ec *EventCost) rateIntervalForRatingID(ratingID string) (ri *RateInterval)
 	return
 }
 
+// Clone will create a clone of the object
 func (ec *EventCost) Clone() (cln *EventCost) {
 	if ec == nil {
 		return
@@ -228,7 +234,7 @@ func (ec *EventCost) ResetCounters() {
 	}
 }
 
-// ComputeCost iterates through Charges, computing EventCost.Cost
+// GetCost iterates through Charges, computing EventCost.Cost
 func (ec *EventCost) GetCost() float64 {
 	if ec.Cost == nil {
 		var cost float64
@@ -241,7 +247,7 @@ func (ec *EventCost) GetCost() float64 {
 	return *ec.Cost
 }
 
-// ComputeUsage iterates through Charges, computing EventCost.Usage
+// GetUsage iterates through Charges, computing EventCost.Usage
 func (ec *EventCost) GetUsage() time.Duration {
 	if ec.Usage == nil {
 		var usage time.Duration
@@ -264,7 +270,7 @@ func (ec *EventCost) ComputeEventCostUsageIndexes() {
 	}
 }
 
-// AsCallDescriptor converts an EventCost into a CallDescriptor
+// AsRefundIncrements converts an EventCost into a CallDescriptor
 func (ec *EventCost) AsRefundIncrements(tor string) (cd *CallDescriptor) {
 	cd = &CallDescriptor{
 		CgrID:         ec.CGRID,
@@ -463,7 +469,7 @@ func (ec *EventCost) appendCIlFromEC(oEC *EventCost, cIlIdx int) {
 func (ec *EventCost) appendChargingIntervalFromEventCost(oEC *EventCost, cIlIdx int) {
 	lenChargers := len(ec.Charges)
 	if lenChargers != 0 && ec.Charges[lenChargers-1].PartiallyEquals(oEC.Charges[cIlIdx]) {
-		ec.Charges[lenChargers-1].CompressFactor += 1
+		ec.Charges[lenChargers-1].CompressFactor++
 	} else {
 		ec.appendCIlFromEC(oEC, cIlIdx)
 	}
@@ -793,7 +799,7 @@ func (ec *EventCost) Trim(atUsage time.Duration) (srplusEC *EventCost, err error
 		}
 		if len(srplsIncrements) != 0 { // partially covering, need trim
 			if lastActiveCIl.CompressFactor > 1 { // ChargingInterval not covering in full, need to split it
-				lastActiveCIl.CompressFactor -= 1
+				lastActiveCIl.CompressFactor--
 				ec.Charges = append(ec.Charges, lastActiveCIl.Clone())
 				lastActiveCIl = ec.Charges[len(ec.Charges)-1]
 				lastActiveCIl.CompressFactor = 1
@@ -833,3 +839,142 @@ func (ec *EventCost) Trim(atUsage time.Duration) (srplusEC *EventCost, err error
 	ec.RemoveStaleReferences() // data should be transferred by now, can clean the old one
 	return
 }
+
+// getIndex returns the path and index if index present
+// path[index]=>path,index
+// path=>path,nil
+func getIndex(spath string) (opath string, idx *int) {
+	idxStart := strings.Index(spath, utils.IdxStart)
+	if idxStart == -1 || !strings.HasSuffix(spath, utils.IdxEnd) {
+		return spath, nil
+	}
+	slctr := spath[idxStart+1 : len(spath)-1]
+	opath = spath[:idxStart]
+	if strings.HasPrefix(slctr, utils.DynamicDataPrefix) {
+		return
+	}
+	idxVal, err := strconv.Atoi(slctr)
+	if err != nil {
+		return spath, nil
+	}
+	return opath, &idxVal
+}
+
+// FieldAsInterface func to implement DataProvider
+func (ec *EventCost) FieldAsInterface(fldPath []string) (val interface{}, err error) {
+	if len(fldPath) == 0 {
+		return nil, utils.ErrNotFound
+	}
+	switch fldPath[0] {
+	default: //"Charges [1]"
+		opath, indx := getIndex(fldPath[0])
+		if opath != utils.Charges {
+			return nil, fmt.Errorf("unsupported field prefix: <%s>", opath)
+		}
+		if indx != nil {
+			chr := ec.Charges[*indx]
+			if len(fldPath) == 1 {
+				return chr, nil
+			}
+			if fldPath[1] == utils.Rating {
+				return ec.getRatingForPath(fldPath[2:], ec.Rating[chr.RatingID])
+			}
+		}
+	case utils.Charges: // not needed?
+		// 	return ec.Charges.FieldAsInterface(fldPath[1:])
+	case utils.CGRID:
+		if len(fldPath) != 1 {
+			return nil, utils.ErrNotFound
+		}
+		return ec.CGRID, nil
+	case utils.RunID:
+		if len(fldPath) != 1 {
+			return nil, utils.ErrNotFound
+		}
+		return ec.RunID, nil
+	case utils.StartTime:
+		if len(fldPath) != 1 {
+			return nil, utils.ErrNotFound
+		}
+		return ec.StartTime, nil
+	case utils.Usage:
+		if len(fldPath) != 1 {
+			return nil, utils.ErrNotFound
+		}
+		return ec.Usage, nil
+	case utils.Cost:
+		if len(fldPath) != 1 {
+			return nil, utils.ErrNotFound
+		}
+		return ec.Cost, nil
+	case utils.AccountSummary:
+		// return ec.AccountSummary.FieldAsInterface(fldPath[1:])
+	case utils.Timings: // not needed?
+		// return ec.Timings.FieldAsInterface(fldPath[1:])
+	case utils.Rates: // not needed?
+		// 	return ec.Rates.FieldAsInterface(fldPath[1:])
+	case utils.RatingFilters: // not needed?
+		// 	return ec.RatingFilters.FieldAsInterface(fldPath[1:])
+	case utils.Accounting: // not needed?
+	// 	return ec.Accounting.FieldAsInterface(fldPath[1:])
+	case utils.Rating: // not needed?
+		// 	return ec.Rating.FieldAsInterface(fldPath[1:])
+	}
+	return nil, fmt.Errorf("unsupported field prefix: <%s>", fldPath[0])
+}
+
+func (ec *EventCost) getRatingForPath(fldPath []string, rating *RatingUnit) (val interface{}, err error) {
+	if rating == nil {
+		return nil, utils.ErrNotFound
+	}
+	if len(fldPath) == 0 {
+		return rating, nil
+	}
+
+	switch fldPath[0] {
+	default:
+		opath, indx := getIndex(fldPath[0])
+		if opath != utils.Rates {
+			return nil, fmt.Errorf("unsupported field prefix: <%s>", opath)
+		}
+		rts, has := ec.Rates[rating.RatesID]
+		if !has || rts == nil {
+			return nil, utils.ErrNotFound
+		}
+		if indx != nil {
+			rt := rts[*indx]
+			if len(fldPath) == 1 {
+				return rt, nil
+			}
+			return rt.FieldAsInterface(fldPath[1:])
+		}
+	case utils.Rates:
+		rts, has := ec.Rates[rating.RatesID]
+		if !has || rts == nil {
+			return nil, utils.ErrNotFound
+		}
+		if len(fldPath) != 1 {
+			return nil, utils.ErrNotFound // no field on slice
+		}
+		return rts, nil
+	case utils.Timing:
+		tmg, has := ec.Timings[rating.TimingID]
+		if !has || tmg == nil {
+			return nil, utils.ErrNotFound
+		}
+		if len(fldPath) == 1 {
+			return tmg, nil
+		}
+		return tmg.FieldAsInterface(fldPath[1:])
+	case utils.RatingFilter:
+		rtFltr, has := ec.RatingFilters[rating.RatingFiltersID]
+		if !has || rtFltr == nil {
+			return nil, utils.ErrNotFound
+		}
+		if len(fldPath) == 1 {
+			return rtFltr, nil
+		}
+		return rtFltr.FieldAsInterface(fldPath[1:])
+	}
+	return rating.FieldAsInterface(fldPath)
+}
diff --git a/engine/suppliers.go b/engine/suppliers.go
index 0b186251c..2116a6c2e 100644
--- a/engine/suppliers.go
+++ b/engine/suppliers.go
@@ -160,8 +160,7 @@ func (spS *SupplierService) matchingSupplierProfilesForEvent(ev *utils.CGREvent,
 	if singleResult {
 		matchingSLP = make([]*SupplierProfile, 1)
 	}
-	evNm := config.NewNavigableMap(nil)
-	evNm.Set([]string{utils.MetaReq}, ev.Event, false, false)
+	evNm := config.NewNavigableMap(map[string]interface{}{utils.MetaReq: ev.Event})
 	for lpID := range sPrflIDs {
 		splPrfl, err := spS.dm.GetSupplierProfile(ev.Tenant, lpID, true, true, utils.NonTransactional)
 		if err != nil {
diff --git a/servmanager/servmanager.go b/servmanager/servmanager.go
index da4e4dc2e..13c6302f7 100644
--- a/servmanager/servmanager.go
+++ b/servmanager/servmanager.go
@@ -147,8 +147,8 @@ func (srvMngr *ServiceManager) GetConfig() *config.CGRConfig {
 func (srvMngr *ServiceManager) StartServices() (err error) {
 	go srvMngr.handleReload()
 	for serviceName, shouldRun := range map[string]bool{
-		utils.APIerSv1:         srvMngr.GetConfig().ApierCfg().Enabled,
-		utils.APIerSv2:         srvMngr.GetConfig().ApierCfg().Enabled,
+		utils.APIerSv1:        srvMngr.GetConfig().ApierCfg().Enabled,
+		utils.APIerSv2:        srvMngr.GetConfig().ApierCfg().Enabled,
 		utils.StorDB:          srvMngr.GetConfig().RalsCfg().Enabled || srvMngr.GetConfig().CdrsCfg().Enabled,
 		utils.AttributeS:      srvMngr.GetConfig().AttributeSCfg().Enabled,
 		utils.ChargerS:        srvMngr.GetConfig().ChargerSCfg().Enabled,
diff --git a/sessions/libsessions.go b/sessions/libsessions.go
index b88061048..21eb7c124 100644
--- a/sessions/libsessions.go
+++ b/sessions/libsessions.go
@@ -48,6 +48,7 @@ type BiRPClient interface {
 
 // getSessionTTL retrieves SessionTTL setting out of ev
 // if SessionTTLMaxDelay is present in ev, the return is randomized
+// ToDo: remove if not needed
 func getSessionTTL(ev *engine.MapEvent, cfgSessionTTL time.Duration,
 	cfgSessionTTLMaxDelay *time.Duration) (ttl time.Duration, err error) {
 	if ttl, err = ev.GetDuration(utils.SessionTTL); err != nil {
diff --git a/sessions/sessions.go b/sessions/sessions.go
index 293b8120d..bde37968b 100644
--- a/sessions/sessions.go
+++ b/sessions/sessions.go
@@ -293,7 +293,7 @@ func (sS *SessionS) setSTerminator(s *Session) {
 			s.sTerminator.timer.Stop()
 		}
 	}()
-	time.Sleep(1) // force context switch to fix process message
+	time.Sleep(1) // force context switching
 }
 
 // forceSTerminate is called when a session times-out or it is forced from CGRateS side
diff --git a/utils/consts.go b/utils/consts.go
index df676bd51..823cd4284 100755
--- a/utils/consts.go
+++ b/utils/consts.go
@@ -490,6 +490,13 @@ const (
 	Categories                  = "Categories"
 	Blocker                     = "Blocker"
 	RatingPlanID                = "RatingPlanID"
+	StartTime                   = "StartTime"
+	AccountSummary              = "AccountSummary"
+	RatingFilters               = "RatingFilters"
+	RatingFilter                = "RatingFilter"
+	Accounting                  = "Accounting"
+	Rating                      = "Rating"
+	Charges                     = "Charges"
 	MetaSessionS                = "*sessions"
 	MetaDefault                 = "*default"
 	Error                       = "Error"
@@ -1181,7 +1188,7 @@ const (
 	APIerSv1GetAttributeProfile      = "APIerSv1.GetAttributeProfile"
 	APIerSv1GetAttributeProfileIDs   = "APIerSv1.GetAttributeProfileIDs"
 	APIerSv1RemoveAttributeProfile   = "APIerSv1.RemoveAttributeProfile"
-	APIerSv2SetAttributeProfile       = "APIerSv2.SetAttributeProfile"
+	APIerSv2SetAttributeProfile      = "APIerSv2.SetAttributeProfile"
 	AttributeSv1GetAttributeForEvent = "AttributeSv1.GetAttributeForEvent"
 	AttributeSv1ProcessEvent         = "AttributeSv1.ProcessEvent"
 	AttributeSv1Ping                 = "AttributeSv1.Ping"