diff --git a/internal/pkg/intf/appif.go b/internal/pkg/intf/appif.go
new file mode 100644
index 0000000..76ea4d4
--- /dev/null
+++ b/internal/pkg/intf/appif.go
@@ -0,0 +1,37 @@
+/*
+* Copyright 2022-present Open Networking Foundation
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+package intf
+
+// App Interface
+type App interface {
+	PortAddInd(string, uint32, string)
+	PortDelInd(string, string)
+	PortUpdateInd(string, string, uint32)
+	PacketInInd(string, string, []byte)
+	PortUpInd(string, string)
+	PortDownInd(string, string)
+	AddDevice(string, string, string)
+	DeviceUpInd(string)
+	DeviceDownInd(string)
+	DelDevice(string)
+	SetRebootFlag(bool)
+	ProcessFlowModResultIndication(FlowStatus)
+	DeviceRebootInd(string, string, string)
+	DeviceDisableInd(string)
+	UpdateMvlanProfilesForDevice(string)
+	TriggerPendingProfileDeleteReq(string)
+	TriggerPendingMigrateServicesReq(string)
+}