diff --git a/src/controllers/index.js b/src/controllers/index.js
index 0437ee4..aa40379 100644
--- a/src/controllers/index.js
+++ b/src/controllers/index.js
@@ -4,9 +4,11 @@ const confirmService = require('@services/apis/confirm')
 const selectService = require('@services/apis/select')
 const statusService = require('@services/apis/status')
 const cancelService = require('@services/apis/cancel')
+const sessionService = require('@services/session')
 const searchService = require('@services/apis/search')
 const initService = require('@services/apis/init')
 
+
 exports.search = async (req, res) => {
 	try {
 		await res.status(200).send(responses.success_ack)
@@ -60,3 +62,13 @@ exports.status = async (req, res) => {
 		console.log(err)
 	}
 }
+
+exports.sessionUpdate = async (req, res) => {
+	try {
+		console.debug(JSON.stringify(req.body, null, '\t'))
+		res.status(200).send(responses.success_ack)
+		await sessionService.session(req.body)
+	} catch (err) {
+		console.log(err)
+	}
+}
diff --git a/src/database/storage/bap/queries.js b/src/database/storage/bap/queries.js
index 26a5771..3a95fed 100644
--- a/src/database/storage/bap/queries.js
+++ b/src/database/storage/bap/queries.js
@@ -27,3 +27,11 @@ exports.findOrCreate = async ({ where = {}, defaults = {} }) => {
 		throw err
 	}
 }
+
+exports.findByIds = async (ids) => {
+	try {
+		return await Bap.find({ _id: { $in: ids } }).lean()
+	} catch (err) {
+		console.log(err)
+	}
+}
diff --git a/src/database/storage/sessionAttendance/queries.js b/src/database/storage/sessionAttendance/queries.js
index c9e203e..658e056 100644
--- a/src/database/storage/sessionAttendance/queries.js
+++ b/src/database/storage/sessionAttendance/queries.js
@@ -55,3 +55,10 @@ exports.setStatusAsCancelledById = async (id, { reasonId, reasonDesc }) => {
 		console.log('SessionAttendance.findByOrderId: ', err)
 	}
 }
+exports.findBySessionId = async (sessionId) => {
+	try {
+		return await SessionAttendance.find({ sessionId: sessionId })
+	} catch (err) {
+		console.log('SessionAttendance.findBySessionId: ', err)
+	}
+}
diff --git a/src/database/storage/user/queries.js b/src/database/storage/user/queries.js
index 973934e..25eef08 100644
--- a/src/database/storage/user/queries.js
+++ b/src/database/storage/user/queries.js
@@ -35,3 +35,11 @@ exports.findOrCreate = async ({ where = {}, defaults = {} }) => {
 		throw err
 	}
 }
+
+exports.findByIds = async (ids) => {
+	try {
+		return await User.find({ _id: { $in: ids } }).lean()
+	} catch (err) {
+		console.log(err)
+	}
+}
diff --git a/src/dtos/onUpdateRequest.js b/src/dtos/onUpdateRequest.js
new file mode 100644
index 0000000..022ce3f
--- /dev/null
+++ b/src/dtos/onUpdateRequest.js
@@ -0,0 +1,15 @@
+'use strict'
+
+exports.onUpdateRequestDTO = async (context, statusBody, orderId, status) => {
+	return {
+		context,
+		message: {
+			order: {
+				id: orderId,
+				state: status,
+				type: 'DEFAULT',
+				provider: statusBody,
+			},
+		},
+	}
+}
diff --git a/src/routes/index.js b/src/routes/index.js
index 2cc93d0..6479483 100644
--- a/src/routes/index.js
+++ b/src/routes/index.js
@@ -10,5 +10,6 @@ router.post('/init', bppController.init)
 router.post('/confirm', bppController.confirm)
 router.post('/cancel', bppController.cancel)
 router.post('/status', bppController.status)
+router.post('/sessionUpdate', bppController.sessionUpdate)
 
 module.exports = router
diff --git a/src/services/protocolCallbacks/index.js b/src/services/protocolCallbacks/index.js
index ca73e4b..5a0a022 100644
--- a/src/services/protocolCallbacks/index.js
+++ b/src/services/protocolCallbacks/index.js
@@ -4,7 +4,9 @@ const { onConfirm } = require('./onConfirm')
 const { onSelect } = require('./onSelect')
 const { onStatus } = require('./onStatus')
 const { onCancel } = require('./onCancel')
+const { onUpdate } = require('./onUpdate')
 const { onSearch } = require('./onSearch')
 const { onInit } = require('./onInit')
-const protocolCallbacks = { onConfirm, onSelect, onStatus, onCancel, onSearch, onInit }
+
+const protocolCallbacks = { onConfirm, onSelect, onStatus, onCancel, onSearch, onInit, onUpdate }
 module.exports = protocolCallbacks
diff --git a/src/services/protocolCallbacks/onUpdate.js b/src/services/protocolCallbacks/onUpdate.js
new file mode 100644
index 0000000..5f21858
--- /dev/null
+++ b/src/services/protocolCallbacks/onUpdate.js
@@ -0,0 +1,37 @@
+'use strict'
+
+const { contextBuilder } = require('@utils/contextBuilder')
+const { onUpdateRequestDTO } = require('@dtos/onUpdateRequest')
+const { externalRequests } = require('@helpers/requests')
+const { internalRequests } = require('@helpers/requests')
+
+exports.onUpdate = async (callbackData) => {
+	try {
+		const context = await contextBuilder(
+			callbackData.transactionId,
+			callbackData.messageId,
+			process.env.ON_UPDATE_ACTION
+		)
+		const response = await internalRequests.catalogGET({
+			route: process.env.CATALOG_GET_STATUS_BODY_ROUTE,
+			pathParams: {
+				sessionId: callbackData.sessionId,
+				fulfillmentId: callbackData.fulfillmentId,
+			},
+		})
+		const statusBody = response.statusBody
+		const onUpdateRequest = await onUpdateRequestDTO(
+			context,
+			statusBody.providers[0],
+			callbackData.orderId,
+			callbackData.status
+		)
+		await externalRequests.callbackPOST({
+			baseURL: callbackData.bapUri,
+			route: process.env.ON_UPDATE_ROUTE,
+			body: onUpdateRequest,
+		})
+	} catch (err) {
+		console.log('OnUpdate.ProtocolCallbacks.services: ', err)
+	}
+}
diff --git a/src/services/session.js b/src/services/session.js
new file mode 100644
index 0000000..e6e49cc
--- /dev/null
+++ b/src/services/session.js
@@ -0,0 +1,50 @@
+'use strict'
+
+const protocolCallbacks = require('@services/protocolCallbacks/')
+const sessionAttendanceQueries = require('@database/storage/sessionAttendance/queries')
+const userQueries = require('@database/storage/user/queries')
+const bapQueries = require('@database/storage/bap/queries')
+const crypto = require('crypto')
+
+exports.session = async (requestBody) => {
+	try {
+		const sessionId = requestBody.sessionId
+		const sessionAttendance = await sessionAttendanceQueries.findBySessionId(sessionId)
+		if (!sessionAttendance) {
+			return console.log('SessionAttendance Not Found')
+		}
+		const userIds = sessionAttendance.map((sessionAttendee) => sessionAttendee.userId)
+		const users = await userQueries.findByIds(userIds)
+		if (!users) {
+			return console.log('Users Not Found')
+		}
+		const bapIds = users.map((user) => user.bapId)
+		const baps = await bapQueries.findByIds(bapIds)
+		if (!baps) {
+			return console.log('BAP Not Found')
+		}
+		let usersWithBapAndAttendance = users.map((user) => {
+			const bapInfo = baps.find((f) => f._id.toString() === user.bapId.toString())
+			const sessionAttendanceInfo = sessionAttendance.find((f) => f.userId.toString() === user._id.toString())
+			return {
+				...user,
+				bapInfo,
+				sessionAttendanceInfo,
+			}
+		})
+		usersWithBapAndAttendance.map(async (user) => {
+			await protocolCallbacks.onUpdate({
+				transactionId: crypto.randomUUID(),
+				messageId: crypto.randomUUID(),
+				bapId: user.bapInfo.bapId,
+				bapUri: user.bapInfo.bapUri,
+				status: user.sessionAttendanceInfo.statusText,
+				sessionId: sessionId.toString(),
+				fulfillmentId: user.sessionAttendanceInfo.fulfillmentId.toString(),
+				orderId: user.sessionAttendanceInfo.orderId.toString(),
+			})
+		})
+	} catch (err) {
+		console.log(err)
+	}
+}