diff --git a/sessions/sessions_processeventrates_it_test.go b/sessions/sessions_processeventrates_it_test.go
new file mode 100644
index 000000000..333fb75a1
--- /dev/null
+++ b/sessions/sessions_processeventrates_it_test.go
@@ -0,0 +1,215 @@
+//go:build integration
+// +build integration
+
+/*
+Real-time Online/Offline Charging System (OCS) for Telecom & ISP environments
+Copyright (C) ITsysCOM GmbH
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with this program.  If not, see <https://www.gnu.org/licenses/>
+*/
+
+package sessions
+
+import (
+	"testing"
+	"time"
+
+	"github.com/cgrates/birpc/context"
+	"github.com/cgrates/cgrates/engine"
+	"github.com/cgrates/cgrates/utils"
+)
+
+func TestSessionSv1ProcessEventRates(t *testing.T) {
+	var dbcfg engine.DBCfg
+	switch *utils.DBType {
+	case utils.MetaInternal:
+		dbcfg = engine.InternalDBCfg
+	case utils.MetaRedis:
+		dbcfg = engine.RedisDBCfg
+	case utils.MetaMySQL:
+		dbcfg = engine.MySQLDBCfg
+	case utils.MetaMongo:
+		dbcfg = engine.MongoDBCfg
+	case utils.MetaPostgres:
+		dbcfg = engine.PostgresDBCfg
+	default:
+		t.Fatal("unsupported dbtype value")
+	}
+
+	ng := engine.TestEngine{
+		ConfigJSON: `{
+"sessions": {
+    "enabled": true,
+    "rates_conns": ["*localhost"]
+},
+"rates": {
+    "enabled": true
+},
+"admins": {
+    "enabled": true
+}
+}`,
+		TpFiles: map[string]string{
+			utils.RatesCsv: `#Tenant,ID,FilterIDs,Weights,MinCost,MaxCost,MaxCostStrategy,RateID,RateFilterIDs,RateActivationStart,RateWeights,RateBlocker,RateIntervalStart,RateFixedFee,RateRecurrentFee,RateUnit,RateIncrement
+cgrates.org,RP_SIMPLE,,;10,,,,RT_SIMPLE,*string:~*req.Destination:1002,"* * * * *",;10,false,0s,0,1,1m,1m`,
+		},
+		DBCfg:    dbcfg,
+		Encoding: *utils.Encoding,
+		// LogBuffer: new(bytes.Buffer),
+	}
+
+	// t.Cleanup(func() {
+	// 	if ng.LogBuffer != nil {
+	// 		fmt.Println(ng.LogBuffer)
+	// 	}
+	// })
+
+	client, _ := ng.Run(t)
+	time.Sleep(100 * time.Millisecond)
+
+	t.Run("noFlags", func(t *testing.T) {
+		var rply V1ProcessEventReply
+		err := client.Call(context.Background(), utils.SessionSv1ProcessEvent,
+			&utils.CGREvent{
+				Tenant:  "cgrates.org",
+				ID:      "noFlags",
+				APIOpts: map[string]any{},
+				Event: map[string]any{
+					utils.AccountField: "1001",
+					utils.Destination:  "1002",
+					utils.AnswerTime:   "2018-01-07T17:00:00Z",
+				},
+			}, &rply)
+
+		if err != nil {
+			t.Fatalf("ProcessEvent failed without rates flag: %v", err)
+		}
+		if len(rply.RateSCost) > 0 {
+			t.Errorf("RateSCost should be empty without *rates flag, got: %v", rply.RateSCost)
+		}
+	})
+
+	t.Run("ratesFlag", func(t *testing.T) {
+		var rply V1ProcessEventReply
+		err := client.Call(context.Background(), utils.SessionSv1ProcessEvent,
+			&utils.CGREvent{
+				Tenant: "cgrates.org",
+				ID:     "ratesFlag",
+				APIOpts: map[string]any{
+					utils.MetaRates: true,
+					utils.MetaUsage: 1 * time.Minute,
+				},
+				Event: map[string]any{
+					utils.AccountField: "1001",
+					utils.Destination:  "1002",
+					utils.AnswerTime:   "2018-01-07T17:00:00Z",
+				},
+			}, &rply)
+
+		if err != nil {
+			t.Fatalf("ProcessEvent failed with *rates flag: %v", err)
+		}
+		if rply.RateSCost == nil {
+			t.Fatal("RateSCost should not be nil with *rates flag")
+		}
+		cost, exists := rply.RateSCost[utils.MetaDefault]
+		if !exists {
+			t.Fatalf("no RateSCost entry for *default runID, got: %v", rply.RateSCost)
+		}
+		const wantCost = 1.0
+		if cost != wantCost {
+			t.Errorf("RateSCost[*default] = %g, want %g", cost, wantCost)
+		}
+	})
+
+	t.Run("ratesSecondInterval", func(t *testing.T) {
+		var rply V1ProcessEventReply
+		err := client.Call(context.Background(), utils.SessionSv1ProcessEvent,
+			&utils.CGREvent{
+				Tenant: "cgrates.org",
+				ID:     "ratesSecondInterval",
+				APIOpts: map[string]any{
+					utils.MetaRates: true,
+					utils.MetaUsage: 2 * time.Minute,
+				},
+				Event: map[string]any{
+					utils.AccountField: "1001",
+					utils.Destination:  "1002",
+					utils.AnswerTime:   "2018-01-07T17:00:00Z",
+				},
+			}, &rply)
+
+		if err != nil {
+			t.Fatalf("ProcessEvent failed: %v", err)
+		}
+		if rply.RateSCost == nil {
+			t.Fatal("RateSCost should not be nil")
+		}
+		cost, exists := rply.RateSCost[utils.MetaDefault]
+		if !exists {
+			t.Fatalf("no RateSCost entry for *default runID, got: %v", rply.RateSCost)
+		}
+		const wantCost = 2.0
+		if cost != wantCost {
+			t.Errorf("RateSCost[*default] = %g, want %g", cost, wantCost)
+		}
+	})
+
+	t.Run("ratesDisabled", func(t *testing.T) {
+		var rply V1ProcessEventReply
+		err := client.Call(context.Background(), utils.SessionSv1ProcessEvent,
+			&utils.CGREvent{
+				Tenant: "cgrates.org",
+				ID:     "ratesDisabled",
+				APIOpts: map[string]any{
+					utils.MetaRates: false,
+					utils.MetaUsage: 2*time.Minute + 30*time.Second,
+				},
+				Event: map[string]any{
+					utils.AccountField: "1001",
+					utils.Destination:  "1002",
+					utils.AnswerTime:   "2018-01-07T17:00:00Z",
+				},
+			}, &rply)
+
+		if err != nil {
+			t.Fatalf("ProcessEvent failed: %v", err)
+		}
+		if len(rply.RateSCost) > 0 {
+			t.Errorf("RateSCost should be empty when *rates=false, got: %v", rply.RateSCost)
+		}
+	})
+
+	t.Run("noMatchingRate", func(t *testing.T) {
+		var rply V1ProcessEventReply
+
+		if err := client.Call(context.Background(), utils.SessionSv1ProcessEvent,
+			&utils.CGREvent{
+				Tenant: "cgrates.org",
+				ID:     "noMatchingRate",
+				APIOpts: map[string]any{
+					utils.MetaRates: true,
+					utils.MetaUsage: 1 * time.Minute,
+				},
+				Event: map[string]any{
+					utils.AccountField: "1001",
+					utils.Destination:  "9999",
+					utils.AnswerTime:   "2018-01-07T17:00:00Z",
+				},
+			}, &rply,
+		); err == nil {
+			t.Fatal("expected error, got none")
+		}
+	})
+}