diff --git a/pkg/eval/ievaluator.go b/pkg/eval/ievaluator.go
index 7f772f461..af37e5102 100644
--- a/pkg/eval/ievaluator.go
+++ b/pkg/eval/ievaluator.go
@@ -12,19 +12,13 @@ const (
 	NotificationUpdate StateChangeNotificationType = "update"
 )
 
-type StateChangeNotification struct {
-	Type    StateChangeNotificationType `json:"type"`
-	Source  string                      `json:"source"`
-	FlagKey string                      `json:"flagKey"`
-}
-
 /*
 IEvaluator implementations store the state of the flags,
 do parsing and validation of the flag state and evaluate flags in response to handlers.
 */
 type IEvaluator interface {
 	GetState() (string, error)
-	SetState(source string, state string) ([]StateChangeNotification, error)
+	SetState(source string, state string) (map[string]interface{}, error)
 
 	ResolveBooleanValue(
 		reqID string,
@@ -47,26 +41,3 @@ type IEvaluator interface {
 		flagKey string,
 		context *structpb.Struct) (value map[string]any, variant string, reasons string, err error)
 }
-
-func (s *StateChangeNotification) ToMap() map[string]interface{} {
-	return map[string]interface{}{
-		"type":    string(s.Type),
-		"source":  s.Source,
-		"flagKey": s.FlagKey,
-	}
-}
-
-func StateChangeNotificationsToMap(scns []StateChangeNotification) map[string]interface{} {
-	m := make(map[string]interface{}, len(scns))
-
-	for _, scn := range scns {
-		m[scn.FlagKey] = map[string]interface{}{
-			"type":   string(scn.Type),
-			"source": scn.Source,
-		}
-	}
-
-	return map[string]interface{}{
-		"flags": m,
-	}
-}
diff --git a/pkg/eval/json_evaluator.go b/pkg/eval/json_evaluator.go
index 8aeba0ea5..e6a1277d3 100644
--- a/pkg/eval/json_evaluator.go
+++ b/pkg/eval/json_evaluator.go
@@ -49,7 +49,7 @@ func (je *JSONEvaluator) GetState() (string, error) {
 	return string(data), nil
 }
 
-func (je *JSONEvaluator) SetState(source string, state string) ([]StateChangeNotification, error) {
+func (je *JSONEvaluator) SetState(source string, state string) (map[string]interface{}, error) {
 	schemaLoader := gojsonschema.NewStringLoader(schema.FlagdDefinitions)
 	flagStringLoader := gojsonschema.NewStringLoader(state)
 	result, err := gojsonschema.Validate(schemaLoader, flagStringLoader)
diff --git a/pkg/eval/json_evaluator_model.go b/pkg/eval/json_evaluator_model.go
index d85559674..97076ceba 100644
--- a/pkg/eval/json_evaluator_model.go
+++ b/pkg/eval/json_evaluator_model.go
@@ -16,18 +16,17 @@ type Evaluators struct {
 	Evaluators map[string]json.RawMessage `json:"$evaluators"`
 }
 
-func (f Flags) Merge(logger *logger.Logger, source string, ff Flags) (Flags, []StateChangeNotification) {
-	notifications := []StateChangeNotification{}
+func (f Flags) Merge(logger *logger.Logger, source string, ff Flags) (Flags, map[string]interface{}) {
+	notifications := map[string]interface{}{}
 	result := Flags{Flags: make(map[string]Flag)}
 	for k, v := range f.Flags {
 		if v.Source == source {
 			if _, ok := ff.Flags[k]; !ok {
 				// flag has been deleted
-				notifications = append(notifications, StateChangeNotification{
-					Type:    NotificationDelete,
-					Source:  source,
-					FlagKey: k,
-				})
+				notifications[k] = map[string]interface{}{
+					"type":   string(NotificationDelete),
+					"source": source,
+				}
 				continue
 			}
 		}
@@ -37,11 +36,10 @@ func (f Flags) Merge(logger *logger.Logger, source string, ff Flags) (Flags, []S
 		v.Source = source
 		val, ok := result.Flags[k]
 		if !ok {
-			notifications = append(notifications, StateChangeNotification{
-				Type:    NotificationCreate,
-				Source:  source,
-				FlagKey: k,
-			})
+			notifications[k] = map[string]interface{}{
+				"type":   string(NotificationCreate),
+				"source": source,
+			}
 		} else if !reflect.DeepEqual(val, v) {
 			if val.Source != source {
 				logger.Warn(
@@ -53,11 +51,10 @@ func (f Flags) Merge(logger *logger.Logger, source string, ff Flags) (Flags, []S
 					),
 				)
 			}
-			notifications = append(notifications, StateChangeNotification{
-				Type:    NotificationUpdate,
-				Source:  source,
-				FlagKey: k,
-			})
+			notifications[k] = map[string]interface{}{
+				"type":   string(NotificationUpdate),
+				"source": source,
+			}
 		}
 		result.Flags[k] = v
 	}
diff --git a/pkg/eval/json_evaluator_test.go b/pkg/eval/json_evaluator_test.go
index fd2132381..96a986338 100644
--- a/pkg/eval/json_evaluator_test.go
+++ b/pkg/eval/json_evaluator_test.go
@@ -744,35 +744,35 @@ func TestMergeFlags(t *testing.T) {
 		new        eval.Flags
 		newSource  string
 		want       eval.Flags
-		wantNotifs []eval.StateChangeNotification
+		wantNotifs map[string]interface{}
 	}{
 		{
 			name:       "both nil",
 			current:    eval.Flags{Flags: nil},
 			new:        eval.Flags{Flags: nil},
 			want:       eval.Flags{Flags: map[string]eval.Flag{}},
-			wantNotifs: []eval.StateChangeNotification{},
+			wantNotifs: map[string]interface{}{},
 		},
 		{
 			name:       "both empty flags",
 			current:    eval.Flags{Flags: map[string]eval.Flag{}},
 			new:        eval.Flags{Flags: map[string]eval.Flag{}},
 			want:       eval.Flags{Flags: map[string]eval.Flag{}},
-			wantNotifs: []eval.StateChangeNotification{},
+			wantNotifs: map[string]interface{}{},
 		},
 		{
 			name:       "empty current",
 			current:    eval.Flags{Flags: nil},
 			new:        eval.Flags{Flags: map[string]eval.Flag{}},
 			want:       eval.Flags{Flags: map[string]eval.Flag{}},
-			wantNotifs: []eval.StateChangeNotification{},
+			wantNotifs: map[string]interface{}{},
 		},
 		{
 			name:       "empty new",
 			current:    eval.Flags{Flags: map[string]eval.Flag{}},
 			new:        eval.Flags{Flags: nil},
 			want:       eval.Flags{Flags: map[string]eval.Flag{}},
-			wantNotifs: []eval.StateChangeNotification{},
+			wantNotifs: map[string]interface{}{},
 		},
 		{
 			name: "extra fields on each",
@@ -798,8 +798,8 @@ func TestMergeFlags(t *testing.T) {
 					Source:         "2",
 				},
 			}},
-			wantNotifs: []eval.StateChangeNotification{
-				{Type: "write", Source: "2", FlagKey: "paka"},
+			wantNotifs: map[string]interface{}{
+				"paka": map[string]interface{}{"type": "write", "source": "2"},
 			},
 		},
 		{
@@ -815,9 +815,9 @@ func TestMergeFlags(t *testing.T) {
 				"waka": {DefaultVariant: "on"},
 				"paka": {DefaultVariant: "on"},
 			}},
-			wantNotifs: []eval.StateChangeNotification{
-				{Type: "update", FlagKey: "waka"},
-				{Type: "write", FlagKey: "paka"},
+			wantNotifs: map[string]interface{}{
+				"waka": map[string]interface{}{"type": "update", "source": ""},
+				"paka": map[string]interface{}{"type": "write", "source": ""},
 			},
 		},
 		{
@@ -831,7 +831,7 @@ func TestMergeFlags(t *testing.T) {
 			want: eval.Flags{Flags: map[string]eval.Flag{
 				"hello": {DefaultVariant: "off"},
 			}},
-			wantNotifs: []eval.StateChangeNotification{},
+			wantNotifs: map[string]interface{}{},
 		},
 	}
 
diff --git a/pkg/eval/mock/ievaluator.go b/pkg/eval/mock/ievaluator.go
index 6cf92db5c..5a31d97a3 100644
--- a/pkg/eval/mock/ievaluator.go
+++ b/pkg/eval/mock/ievaluator.go
@@ -8,7 +8,6 @@ import (
 	reflect "reflect"
 
 	gomock "github.com/golang/mock/gomock"
-	eval "github.com/open-feature/flagd/pkg/eval"
 	structpb "google.golang.org/protobuf/types/known/structpb"
 )
 
@@ -136,10 +135,10 @@ func (mr *MockIEvaluatorMockRecorder) ResolveStringValue(reqID, flagKey, context
 }
 
 // SetState mocks base method.
-func (m *MockIEvaluator) SetState(source, state string) ([]eval.StateChangeNotification, error) {
+func (m *MockIEvaluator) SetState(source, state string) (map[string]interface{}, error) {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "SetState", source, state)
-	ret0, _ := ret[0].([]eval.StateChangeNotification)
+	ret0, _ := ret[0].(map[string]interface{})
 	ret1, _ := ret[1].(error)
 	return ret0, ret1
 }
diff --git a/pkg/runtime/runtime.go b/pkg/runtime/runtime.go
index ca22d4147..81def2c68 100644
--- a/pkg/runtime/runtime.go
+++ b/pkg/runtime/runtime.go
@@ -83,7 +83,9 @@ func (r *Runtime) updateState(ctx context.Context, syncr sync.ISync) error {
 
 	r.Service.Notify(service.Notification{
 		Type: service.ConfigurationChange,
-		Data: eval.StateChangeNotificationsToMap(notifications),
+		Data: map[string]interface{}{
+			"flags": notifications,
+		},
 	})
 	return nil
 }