diff --git a/Gemfile b/Gemfile
index 7f0933b37..334602aad 100644
--- a/Gemfile
+++ b/Gemfile
@@ -78,6 +78,7 @@ gem 'wisper', '2.0.0'
 ##--- gems for channels ---##
 # TODO: bump up gem to 2.0
 gem 'facebook-messenger'
+gem 'line-bot-api'
 gem 'twilio-ruby', '~> 5.32.0'
 # twitty will handle subscription of twitter account events
 # gem 'twitty', git: 'https://github.com/chatwoot/twitty'
diff --git a/Gemfile.lock b/Gemfile.lock
index 31b9f7bbc..8e102838d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -322,6 +322,7 @@ GEM
       addressable (~> 2.7)
     letter_opener (1.7.0)
       launchy (~> 2.2)
+    line-bot-api (1.21.0)
     liquid (5.0.1)
     listen (3.6.0)
       rb-fsevent (~> 0.10, >= 0.10.3)
@@ -661,6 +662,7 @@ DEPENDENCIES
   kaminari
   koala
   letter_opener
+  line-bot-api
   liquid
   listen
   maxminddb
diff --git a/app/controllers/api/v1/accounts/inboxes_controller.rb b/app/controllers/api/v1/accounts/inboxes_controller.rb
index 3b21b70bb..f9a6ce154 100644
--- a/app/controllers/api/v1/accounts/inboxes_controller.rb
+++ b/app/controllers/api/v1/accounts/inboxes_controller.rb
@@ -92,6 +92,8 @@ class Api::V1::Accounts::InboxesController < Api::V1::Accounts::BaseController
       Current.account.api_channels.create!(permitted_params(Channel::Api::EDITABLE_ATTRS)[:channel].except(:type))
     when 'email'
       Current.account.email_channels.create!(permitted_params(Channel::Email::EDITABLE_ATTRS)[:channel].except(:type))
+    when 'line'
+      Current.account.line_channels.create!(permitted_params(Channel::Line::EDITABLE_ATTRS)[:channel].except(:type))
     when 'telegram'
       Current.account.telegram_channels.create!(permitted_params(Channel::Telegram::EDITABLE_ATTRS)[:channel].except(:type))
     end
@@ -122,6 +124,8 @@ class Api::V1::Accounts::InboxesController < Api::V1::Accounts::BaseController
       Channel::Email::EDITABLE_ATTRS
     when 'Channel::Telegram'
       Channel::Telegram::EDITABLE_ATTRS
+    when 'Channel::Line'
+      Channel::Line::EDITABLE_ATTRS
     else
       []
     end
diff --git a/app/controllers/webhooks/line_controller.rb b/app/controllers/webhooks/line_controller.rb
new file mode 100644
index 000000000..74e22f119
--- /dev/null
+++ b/app/controllers/webhooks/line_controller.rb
@@ -0,0 +1,6 @@
+class Webhooks::LineController < ActionController::API
+  def process_payload
+    Webhooks::LineEventsJob.perform_later(params: params.to_unsafe_hash, signature: request.headers['x-line-signature'], post_body: request.raw_post)
+    head :ok
+  end
+end
diff --git a/app/javascript/dashboard/components/widgets/ChannelItem.vue b/app/javascript/dashboard/components/widgets/ChannelItem.vue
index 819d912bd..183f42c10 100644
--- a/app/javascript/dashboard/components/widgets/ChannelItem.vue
+++ b/app/javascript/dashboard/components/widgets/ChannelItem.vue
@@ -76,7 +76,16 @@ export default {
       if (key === 'email') {
         return this.enabledFeatures.channel_email;
       }
-      return ['website', 'twilio', 'api', 'whatsapp', 'sms', 'telegram'].includes(key);
+
+      return [
+        'website',
+        'twilio',
+        'api',
+        'whatsapp',
+        'sms',
+        'telegram',
+        'line',
+      ].includes(key);
     },
   },
   methods: {
diff --git a/app/javascript/dashboard/components/widgets/Thumbnail.vue b/app/javascript/dashboard/components/widgets/Thumbnail.vue
index e43d48a4b..6fe83720b 100644
--- a/app/javascript/dashboard/components/widgets/Thumbnail.vue
+++ b/app/javascript/dashboard/components/widgets/Thumbnail.vue
@@ -35,6 +35,13 @@
       :style="badgeStyle"
       src="~dashboard/assets/images/channels/whatsapp.png"
     />
+    <img
+      v-if="badge === 'Channel::Line'"
+      id="badge"
+      class="source-badge"
+      :style="badgeStyle"
+      src="~dashboard/assets/images/channels/line.png"
+    />
     <img
       v-if="badge === 'Channel::Telegram'"
       id="badge"
diff --git a/app/javascript/dashboard/i18n/locale/en/inboxMgmt.json b/app/javascript/dashboard/i18n/locale/en/inboxMgmt.json
index 8866ff9b3..329c48d31 100644
--- a/app/javascript/dashboard/i18n/locale/en/inboxMgmt.json
+++ b/app/javascript/dashboard/i18n/locale/en/inboxMgmt.json
@@ -172,7 +172,32 @@
         },
         "FINISH_MESSAGE": "Start forwarding your emails to the following email address."
       },
-       "TELEGRAM_CHANNEL": {
+      "LINE_CHANNEL": {
+        "TITLE": "LINE Channel",
+        "DESC": "Integrate with LINE channel and start supporting your customers.",
+        "CHANNEL_NAME": {
+          "LABEL": "Channel Name",
+          "PLACEHOLDER": "Please enter a channel name",
+          "ERROR": "This field is required"
+        },
+        "LINE_CHANNEL_ID": {
+          "LABEL": "LINE Channel ID",
+          "PLACEHOLDER": "LINE Channel ID"
+        },
+        "LINE_CHANNEL_SECRET": {
+          "LABEL": "LINE Channel Secret",
+          "PLACEHOLDER": "LINE Channel Secret"
+        },
+        "LINE_CHANNEL_TOKEN": {
+          "LABEL": "LINE Channel Token",
+          "PLACEHOLDER": "LINE Channel Token"
+        },
+        "SUBMIT_BUTTON": "Create LINE Channel",
+        "API": {
+          "ERROR_MESSAGE": "We were not able to save the LINE channel"
+        }
+      },
+      "TELEGRAM_CHANNEL": {
         "TITLE": "Telegram Channel",
         "DESC": "Integrate with Telegram channel and start supporting your customers.",
         "BOT_TOKEN": {
diff --git a/app/javascript/dashboard/routes/dashboard/settings/inbox/FinishSetup.vue b/app/javascript/dashboard/routes/dashboard/settings/inbox/FinishSetup.vue
index 80b37079c..ad2bab48d 100644
--- a/app/javascript/dashboard/routes/dashboard/settings/inbox/FinishSetup.vue
+++ b/app/javascript/dashboard/routes/dashboard/settings/inbox/FinishSetup.vue
@@ -17,7 +17,15 @@
           <woot-code
             v-if="isATwilioInbox"
             lang="html"
-            :script="twilioCallbackURL"
+            :script="currentInbox.webhook_url"
+          >
+          </woot-code>
+        </div>
+        <div class="medium-6 small-offset-3">
+          <woot-code
+            v-if="isALineInbox"
+            lang="html"
+            :script="currentInbox.webhook_url"
           >
           </woot-code>
         </div>
@@ -75,6 +83,9 @@ export default {
     isAEmailInbox() {
       return this.currentInbox.channel_type === 'Channel::Email';
     },
+    isALineInbox() {
+      return this.currentInbox.channel_type === 'Channel::Line';
+    },
     message() {
       if (this.isATwilioInbox) {
         return `${this.$t('INBOX_MGMT.FINISH.MESSAGE')}. ${this.$t(
diff --git a/app/javascript/dashboard/routes/dashboard/settings/inbox/channel-factory.js b/app/javascript/dashboard/routes/dashboard/settings/inbox/channel-factory.js
index db7fb0c43..0842f9f6b 100644
--- a/app/javascript/dashboard/routes/dashboard/settings/inbox/channel-factory.js
+++ b/app/javascript/dashboard/routes/dashboard/settings/inbox/channel-factory.js
@@ -5,6 +5,7 @@ import Api from './channels/Api';
 import Email from './channels/Email';
 import Sms from './channels/Sms';
 import Whatsapp from './channels/Whatsapp';
+import Line from './channels/Line';
 import Telegram from './channels/Telegram';
 
 const channelViewList = {
@@ -15,6 +16,7 @@ const channelViewList = {
   email: Email,
   sms: Sms,
   whatsapp: Whatsapp,
+  line: Line,
   telegram: Telegram,
 };
 
diff --git a/app/javascript/dashboard/routes/dashboard/settings/inbox/channels/Line.vue b/app/javascript/dashboard/routes/dashboard/settings/inbox/channels/Line.vue
new file mode 100644
index 000000000..339ded821
--- /dev/null
+++ b/app/javascript/dashboard/routes/dashboard/settings/inbox/channels/Line.vue
@@ -0,0 +1,140 @@
+<template>
+  <div class="wizard-body small-9 columns">
+    <page-header
+      :header-title="$t('INBOX_MGMT.ADD.LINE_CHANNEL.TITLE')"
+      :header-content="$t('INBOX_MGMT.ADD.LINE_CHANNEL.DESC')"
+    />
+    <form class="row" @submit.prevent="createChannel()">
+      <div class="medium-8 columns">
+        <label :class="{ error: $v.channelName.$error }">
+          {{ $t('INBOX_MGMT.ADD.LINE_CHANNEL.CHANNEL_NAME.LABEL') }}
+          <input
+            v-model.trim="channelName"
+            type="text"
+            :placeholder="
+              $t('INBOX_MGMT.ADD.LINE_CHANNEL.CHANNEL_NAME.PLACEHOLDER')
+            "
+            @blur="$v.channelName.$touch"
+          />
+          <span v-if="$v.channelName.$error" class="message">{{
+            $t('INBOX_MGMT.ADD.LINE_CHANNEL.CHANNEL_NAME.ERROR')
+          }}</span>
+        </label>
+      </div>
+
+      <div class="medium-8 columns">
+        <label :class="{ error: $v.lineChannelId.$error }">
+          {{ $t('INBOX_MGMT.ADD.LINE_CHANNEL.LINE_CHANNEL_ID.LABEL') }}
+          <input
+            v-model.trim="lineChannelId"
+            type="text"
+            :placeholder="
+              $t('INBOX_MGMT.ADD.LINE_CHANNEL.LINE_CHANNEL_ID.PLACEHOLDER')
+            "
+            @blur="$v.lineChannelId.$touch"
+          />
+        </label>
+      </div>
+
+      <div class="medium-8 columns">
+        <label :class="{ error: $v.lineChannelSecret.$error }">
+          {{ $t('INBOX_MGMT.ADD.LINE_CHANNEL.LINE_CHANNEL_SECRET.LABEL') }}
+          <input
+            v-model.trim="lineChannelSecret"
+            type="text"
+            :placeholder="
+              $t('INBOX_MGMT.ADD.LINE_CHANNEL.LINE_CHANNEL_SECRET.PLACEHOLDER')
+            "
+            @blur="$v.lineChannelSecret.$touch"
+          />
+        </label>
+      </div>
+
+      <div class="medium-8 columns">
+        <label :class="{ error: $v.lineChannelToken.$error }">
+          {{ $t('INBOX_MGMT.ADD.LINE_CHANNEL.LINE_CHANNEL_TOKEN.LABEL') }}
+          <input
+            v-model.trim="lineChannelToken"
+            type="text"
+            :placeholder="
+              $t('INBOX_MGMT.ADD.LINE_CHANNEL.LINE_CHANNEL_TOKEN.PLACEHOLDER')
+            "
+            @blur="$v.lineChannelToken.$touch"
+          />
+        </label>
+      </div>
+
+      <div class="medium-12 columns">
+        <woot-submit-button
+          :loading="uiFlags.isCreating"
+          :button-text="$t('INBOX_MGMT.ADD.LINE_CHANNEL.SUBMIT_BUTTON')"
+        />
+      </div>
+    </form>
+  </div>
+</template>
+
+<script>
+import { mapGetters } from 'vuex';
+import alertMixin from 'shared/mixins/alertMixin';
+import { required } from 'vuelidate/lib/validators';
+import router from '../../../../index';
+import PageHeader from '../../SettingsSubPageHeader';
+
+
+export default {
+  components: {
+    PageHeader,
+  },
+  mixins: [alertMixin],
+  data() {
+    return {
+      channelName: '',
+      lineChannelId: '',
+      lineChannelSecret: '',
+      lineChannelToken: '',
+    };
+  },
+  computed: {
+    ...mapGetters({
+      uiFlags: 'inboxes/getUIFlags',
+    }),
+  },
+  validations: {
+    channelName: { required },
+    lineChannelId: { required },
+    lineChannelSecret: { required },
+    lineChannelToken: { required },
+  },
+  methods: {
+    async createChannel() {
+      this.$v.$touch();
+      if (this.$v.$invalid) {
+        return;
+      }
+
+      try {
+        const lineChannel = await this.$store.dispatch('inboxes/createChannel', {
+          name: this.channelName,
+          channel: {
+            type: 'line',
+            line_channel_id: this.lineChannelId,
+            line_channel_secret: this.lineChannelSecret,
+            line_channel_token: this.lineChannelToken,
+          },
+        });
+
+        router.replace({
+          name: 'settings_inboxes_add_agents',
+          params: {
+            page: 'new',
+            inbox_id: lineChannel.id,
+          },
+        });
+      } catch (error) {
+        this.showAlert(this.$t('INBOX_MGMT.ADD.LINE_CHANNEL.API.ERROR_MESSAGE'));
+      }
+    },
+  },
+};
+</script>
diff --git a/app/javascript/shared/mixins/configMixin.js b/app/javascript/shared/mixins/configMixin.js
index a4e6c62b2..acbe98511 100644
--- a/app/javascript/shared/mixins/configMixin.js
+++ b/app/javascript/shared/mixins/configMixin.js
@@ -3,9 +3,6 @@ export default {
     hostURL() {
       return window.chatwootConfig.hostURL;
     },
-    twilioCallbackURL() {
-      return `${this.hostURL}/twilio/callback`;
-    },
     vapidPublicKey() {
       return window.chatwootConfig.vapidPublicKey;
     },
diff --git a/app/jobs/send_reply_job.rb b/app/jobs/send_reply_job.rb
index 77d17cc22..b834c41ea 100644
--- a/app/jobs/send_reply_job.rb
+++ b/app/jobs/send_reply_job.rb
@@ -11,6 +11,8 @@ class SendReplyJob < ApplicationJob
       ::Twitter::SendOnTwitterService.new(message: message).perform
     when 'Channel::TwilioSms'
       ::Twilio::SendOnTwilioService.new(message: message).perform
+    when 'Channel::Line'
+      ::Line::SendOnLineService.new(message: message).perform
     when 'Channel::Telegram'
       ::Telegram::SendOnTelegramService.new(message: message).perform
     end
diff --git a/app/jobs/webhooks/line_events_job.rb b/app/jobs/webhooks/line_events_job.rb
new file mode 100644
index 000000000..3c17eddb3
--- /dev/null
+++ b/app/jobs/webhooks/line_events_job.rb
@@ -0,0 +1,24 @@
+class Webhooks::LineEventsJob < ApplicationJob
+  queue_as :default
+
+  def perform(params: {}, signature: '', post_body: '')
+    @params = params
+    return unless valid_event_payload?
+    return unless valid_post_body?(post_body, signature)
+
+    Line::IncomingMessageService.new(inbox: @channel.inbox, params: @params['line'].with_indifferent_access).perform
+  end
+
+  private
+
+  def valid_event_payload?
+    @channel = Channel::Line.find_by(line_channel_id: @params[:line_channel_id]) if @params[:line_channel_id]
+  end
+
+  # https://developers.line.biz/en/reference/messaging-api/#signature-validation
+  # validate the line payload
+  def valid_post_body?(post_body, signature)
+    hash = OpenSSL::HMAC.digest(OpenSSL::Digest.new('SHA256'), @channel.line_channel_secret, post_body)
+    Base64.strict_encode64(hash) == signature
+  end
+end
diff --git a/app/models/account.rb b/app/models/account.rb
index 817013373..0b8287be5 100644
--- a/app/models/account.rb
+++ b/app/models/account.rb
@@ -51,6 +51,7 @@ class Account < ApplicationRecord
   has_many :web_widgets, dependent: :destroy, class_name: '::Channel::WebWidget'
   has_many :email_channels, dependent: :destroy, class_name: '::Channel::Email'
   has_many :api_channels, dependent: :destroy, class_name: '::Channel::Api'
+  has_many :line_channels, dependent: :destroy, class_name: '::Channel::Line'
   has_many :telegram_channels, dependent: :destroy, class_name: '::Channel::Telegram'
   has_many :canned_responses, dependent: :destroy
   has_many :webhooks, dependent: :destroy
diff --git a/app/models/channel/api.rb b/app/models/channel/api.rb
index f3d1a9b82..fd8abb594 100644
--- a/app/models/channel/api.rb
+++ b/app/models/channel/api.rb
@@ -18,22 +18,15 @@
 #
 
 class Channel::Api < ApplicationRecord
+  include Channelable
+
   self.table_name = 'channel_api'
   EDITABLE_ATTRS = [:webhook_url].freeze
 
-  validates :account_id, presence: true
-  belongs_to :account
-
   has_secure_token :identifier
   has_secure_token :hmac_token
 
-  has_one :inbox, as: :channel, dependent: :destroy
-
   def name
     'API'
   end
-
-  def has_24_hour_messaging_window?
-    false
-  end
 end
diff --git a/app/models/channel/email.rb b/app/models/channel/email.rb
index 806ae0f08..fe711b01e 100644
--- a/app/models/channel/email.rb
+++ b/app/models/channel/email.rb
@@ -16,25 +16,20 @@
 #
 
 class Channel::Email < ApplicationRecord
+  include Channelable
+
   self.table_name = 'channel_email'
   EDITABLE_ATTRS = [:email].freeze
 
-  validates :account_id, presence: true
-  belongs_to :account
   validates :email, uniqueness: true
   validates :forward_to_email, uniqueness: true
 
-  has_one :inbox, as: :channel, dependent: :destroy
   before_validation :ensure_forward_to_email, on: :create
 
   def name
     'Email'
   end
 
-  def has_24_hour_messaging_window?
-    false
-  end
-
   private
 
   def ensure_forward_to_email
diff --git a/app/models/channel/facebook_page.rb b/app/models/channel/facebook_page.rb
index ade13990e..d564d0048 100644
--- a/app/models/channel/facebook_page.rb
+++ b/app/models/channel/facebook_page.rb
@@ -17,15 +17,12 @@
 #
 
 class Channel::FacebookPage < ApplicationRecord
-  self.table_name = 'channel_facebook_pages'
-
+  include Channelable
   include Reauthorizable
 
-  validates :account_id, presence: true
-  validates :page_id, uniqueness: { scope: :account_id }
-  belongs_to :account
+  self.table_name = 'channel_facebook_pages'
 
-  has_one :inbox, as: :channel, dependent: :destroy
+  validates :page_id, uniqueness: { scope: :account_id }
 
   after_create_commit :subscribe
   before_destroy :unsubscribe
diff --git a/app/models/channel/line.rb b/app/models/channel/line.rb
new file mode 100644
index 000000000..a417dbf64
--- /dev/null
+++ b/app/models/channel/line.rb
@@ -0,0 +1,39 @@
+# == Schema Information
+#
+# Table name: channel_line
+#
+#  id                  :bigint           not null, primary key
+#  line_channel_secret :string           not null
+#  line_channel_token  :string           not null
+#  created_at          :datetime         not null
+#  updated_at          :datetime         not null
+#  account_id          :integer          not null
+#  line_channel_id     :string           not null
+#
+# Indexes
+#
+#  index_channel_line_on_line_channel_id  (line_channel_id) UNIQUE
+#
+
+class Channel::Line < ApplicationRecord
+  include Channelable
+
+  self.table_name = 'channel_line'
+  EDITABLE_ATTRS = [:line_channel_id, :line_channel_secret, :line_channel_token].freeze
+
+  validates :line_channel_id, uniqueness: true, presence: true
+  validates :line_channel_secret, presence: true
+  validates :line_channel_token, presence: true
+
+  def name
+    'LINE'
+  end
+
+  def client
+    @client ||= Line::Bot::Client.new do |config|
+      config.channel_id = line_channel_id
+      config.channel_secret = line_channel_secret
+      config.channel_token = line_channel_token
+    end
+  end
+end
diff --git a/app/models/channel/telegram.rb b/app/models/channel/telegram.rb
index 3dd66dfd3..e0d020f2f 100644
--- a/app/models/channel/telegram.rb
+++ b/app/models/channel/telegram.rb
@@ -15,14 +15,12 @@
 #
 
 class Channel::Telegram < ApplicationRecord
+  include Channelable
+
   self.table_name = 'channel_telegram'
   EDITABLE_ATTRS = [:bot_token].freeze
 
-  has_one :inbox, as: :channel, dependent: :destroy
-  belongs_to :account
-
   before_validation :ensure_valid_bot_token, on: :create
-  validates :account_id, presence: true
   validates :bot_token, presence: true, uniqueness: true
   before_save :setup_telegram_webhook
 
@@ -30,10 +28,6 @@ class Channel::Telegram < ApplicationRecord
     'Telegram'
   end
 
-  def has_24_hour_messaging_window?
-    false
-  end
-
   def telegram_api_url
     "https://api.telegram.org/bot#{bot_token}"
   end
diff --git a/app/models/channel/twilio_sms.rb b/app/models/channel/twilio_sms.rb
index 8f25fec2e..89e9cbdc8 100644
--- a/app/models/channel/twilio_sms.rb
+++ b/app/models/channel/twilio_sms.rb
@@ -17,19 +17,16 @@
 #
 
 class Channel::TwilioSms < ApplicationRecord
+  include Channelable
+
   self.table_name = 'channel_twilio_sms'
 
-  validates :account_id, presence: true
   validates :account_sid, presence: true
   validates :auth_token, presence: true
   validates :phone_number, uniqueness: { scope: :account_id }, presence: true
 
   enum medium: { sms: 0, whatsapp: 1 }
 
-  belongs_to :account
-
-  has_one :inbox, as: :channel, dependent: :destroy
-
   def name
     medium == 'sms' ? 'Twilio SMS' : 'Whatsapp'
   end
diff --git a/app/models/channel/twitter_profile.rb b/app/models/channel/twitter_profile.rb
index 1b1011014..ff2b7c19d 100644
--- a/app/models/channel/twitter_profile.rb
+++ b/app/models/channel/twitter_profile.rb
@@ -16,13 +16,11 @@
 #
 
 class Channel::TwitterProfile < ApplicationRecord
+  include Channelable
+
   self.table_name = 'channel_twitter_profiles'
 
-  validates :account_id, presence: true
   validates :profile_id, uniqueness: { scope: :account_id }
-  belongs_to :account
-
-  has_one :inbox, as: :channel, dependent: :destroy
 
   before_destroy :unsubscribe
 
@@ -30,10 +28,6 @@ class Channel::TwitterProfile < ApplicationRecord
     'Twitter'
   end
 
-  def has_24_hour_messaging_window?
-    false
-  end
-
   def create_contact_inbox(profile_id, name, additional_attributes)
     ActiveRecord::Base.transaction do
       contact = inbox.account.contacts.create!(additional_attributes: additional_attributes, name: name)
diff --git a/app/models/channel/web_widget.rb b/app/models/channel/web_widget.rb
index 58f9b9ec3..38f6e2eb5 100644
--- a/app/models/channel/web_widget.rb
+++ b/app/models/channel/web_widget.rb
@@ -25,7 +25,9 @@
 #
 
 class Channel::WebWidget < ApplicationRecord
+  include Channelable
   include FlagShihTzu
+
   self.table_name = 'channel_web_widgets'
   EDITABLE_ATTRS = [:website_url, :widget_color, :welcome_title, :welcome_tagline, :reply_time, :pre_chat_form_enabled,
                     { pre_chat_form_options: [:pre_chat_message, :require_email] },
@@ -34,8 +36,6 @@ class Channel::WebWidget < ApplicationRecord
   validates :website_url, presence: true
   validates :widget_color, presence: true
 
-  belongs_to :account
-  has_one :inbox, as: :channel, dependent: :destroy
   has_secure_token :website_token
   has_secure_token :hmac_token
 
@@ -50,10 +50,6 @@ class Channel::WebWidget < ApplicationRecord
     'Website'
   end
 
-  def has_24_hour_messaging_window?
-    false
-  end
-
   def web_widget_script
     "
     <script>
diff --git a/app/models/concerns/channelable.rb b/app/models/concerns/channelable.rb
new file mode 100644
index 000000000..76b18fc81
--- /dev/null
+++ b/app/models/concerns/channelable.rb
@@ -0,0 +1,12 @@
+module Channelable
+  extend ActiveSupport::Concern
+  included do
+    validates :account_id, presence: true
+    belongs_to :account
+    has_one :inbox, as: :channel, dependent: :destroy
+  end
+
+  def has_24_hour_messaging_window?
+    false
+  end
+end
diff --git a/app/models/inbox.rb b/app/models/inbox.rb
index e6f89ab21..7e4316ffe 100644
--- a/app/models/inbox.rb
+++ b/app/models/inbox.rb
@@ -93,6 +93,15 @@ class Inbox < ApplicationRecord
     }
   end
 
+  def webhook_url
+    case channel_type
+    when 'Channel::TwilioSMS'
+      "#{ENV['FRONTEND_URL']}/twilio/callback"
+    when 'Channel::Line'
+      "#{ENV['FRONTEND_URL']}/webhooks/line/#{channel.line_channel_id}"
+    end
+  end
+
   private
 
   def delete_round_robin_agents
diff --git a/app/services/line/incoming_message_service.rb b/app/services/line/incoming_message_service.rb
new file mode 100644
index 000000000..60204c8ad
--- /dev/null
+++ b/app/services/line/incoming_message_service.rb
@@ -0,0 +1,65 @@
+class Line::IncomingMessageService
+  include ::FileTypeHelper
+  pattr_initialize [:inbox!, :params!]
+
+  def perform
+    line_contact_info
+    set_contact
+    set_conversation
+    # TODO: iterate over the events and handle the attachments in future
+    # https://github.com/line/line-bot-sdk-ruby#synopsis
+    @message = @conversation.messages.create(
+      content: params[:events].first['message']['text'],
+      account_id: @inbox.account_id,
+      inbox_id: @inbox.id,
+      message_type: :incoming,
+      sender: @contact,
+      source_id: (params[:events].first['message']['id']).to_s
+    )
+    @message.save!
+  end
+
+  private
+
+  def account
+    @account ||= inbox.account
+  end
+
+  def line_contact_info
+    @line_contact_info ||= JSON.parse(inbox.channel.client.get_profile(params[:events].first['source']['userId']).body)
+  end
+
+  def set_contact
+    contact_inbox = ::ContactBuilder.new(
+      source_id: line_contact_info['userId'],
+      inbox: inbox,
+      contact_attributes: contact_attributes
+    ).perform
+
+    @contact_inbox = contact_inbox
+    @contact = contact_inbox.contact
+  end
+
+  def conversation_params
+    {
+      account_id: @inbox.account_id,
+      inbox_id: @inbox.id,
+      contact_id: @contact.id,
+      contact_inbox_id: @contact_inbox.id
+    }
+  end
+
+  def set_conversation
+    @conversation = @contact_inbox.conversations.first
+    return if @conversation
+
+    @conversation = ::Conversation.create!(conversation_params)
+  end
+
+  def contact_attributes
+    {
+      name: line_contact_info['displayName'],
+      avatar_url: line_contact_info['pictureUrl']
+    }
+  end
+end
diff --git a/app/services/line/send_on_line_service.rb b/app/services/line/send_on_line_service.rb
new file mode 100644
index 000000000..6ac3024fc
--- /dev/null
+++ b/app/services/line/send_on_line_service.rb
@@ -0,0 +1,11 @@
+class Line::SendOnLineService < Base::SendOnChannelService
+  private
+
+  def channel_class
+    Channel::Line
+  end
+
+  def perform_reply
+    channel.client.push_message(message.conversation.contact_inbox.source_id, [{ type: 'text', text: message.content }])
+  end
+end
diff --git a/app/views/api/v1/models/_inbox.json.jbuilder b/app/views/api/v1/models/_inbox.json.jbuilder
index 139831b1e..4d97d0a18 100644
--- a/app/views/api/v1/models/_inbox.json.jbuilder
+++ b/app/views/api/v1/models/_inbox.json.jbuilder
@@ -10,6 +10,7 @@ json.out_of_office_message resource.out_of_office_message
 json.csat_survey_enabled resource.csat_survey_enabled
 json.working_hours resource.weekly_schedule
 json.timezone resource.timezone
+json.webhook_url resource.webhook_url
 json.avatar_url resource.try(:avatar_url)
 json.page_id resource.channel.try(:page_id)
 json.widget_color resource.channel.try(:widget_color)
diff --git a/config/routes.rb b/config/routes.rb
index a3e543074..fea3b89b1 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -242,6 +242,7 @@ Rails.application.routes.draw do
   mount Facebook::Messenger::Server, at: 'bot'
   get 'webhooks/twitter', to: 'api/v1/webhooks#twitter_crc'
   post 'webhooks/twitter', to: 'api/v1/webhooks#twitter_events'
+  post 'webhooks/line/:line_channel_id', to: 'webhooks/line#process_payload'
   post 'webhooks/telegram/:bot_token', to: 'webhooks/telegram#process_payload'
 
   namespace :twitter do
diff --git a/db/migrate/20210829124254_add_line_channel.rb b/db/migrate/20210829124254_add_line_channel.rb
new file mode 100644
index 000000000..54995b5b7
--- /dev/null
+++ b/db/migrate/20210829124254_add_line_channel.rb
@@ -0,0 +1,11 @@
+class AddLineChannel < ActiveRecord::Migration[6.1]
+  def change
+    create_table :channel_line do |t|
+      t.integer :account_id, null: false
+      t.string :line_channel_id, null: false, index: { unique: true }
+      t.string :line_channel_secret, null: false
+      t.string :line_channel_token, null: false
+      t.timestamps
+    end
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 5b0e0366b..88af58036 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2021_08_28_124043) do
+ActiveRecord::Schema.define(version: 2021_08_29_124254) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "pg_stat_statements"
@@ -185,6 +185,16 @@ ActiveRecord::Schema.define(version: 2021_08_28_124043) do
     t.index ["page_id"], name: "index_channel_facebook_pages_on_page_id"
   end
 
+  create_table "channel_line", force: :cascade do |t|
+    t.integer "account_id", null: false
+    t.string "line_channel_id", null: false
+    t.string "line_channel_secret", null: false
+    t.string "line_channel_token", null: false
+    t.datetime "created_at", precision: 6, null: false
+    t.datetime "updated_at", precision: 6, null: false
+    t.index ["line_channel_id"], name: "index_channel_line_on_line_channel_id", unique: true
+  end
+
   create_table "channel_telegram", force: :cascade do |t|
     t.string "bot_name"
     t.integer "account_id", null: false
diff --git a/spec/controllers/api/v1/accounts/inboxes_controller_spec.rb b/spec/controllers/api/v1/accounts/inboxes_controller_spec.rb
index b4ac8c70c..2e8ecdaea 100644
--- a/spec/controllers/api/v1/accounts/inboxes_controller_spec.rb
+++ b/spec/controllers/api/v1/accounts/inboxes_controller_spec.rb
@@ -285,6 +285,28 @@ RSpec.describe 'Inboxes API', type: :request do
         expect(response).to have_http_status(:success)
         expect(response.body).to include('test@test.com')
       end
+
+      it 'creates an api inbox when administrator' do
+        post "/api/v1/accounts/#{account.id}/inboxes",
+             headers: admin.create_new_auth_token,
+             params: { name: 'API Inbox', channel: { type: 'api', webhook_url: 'http://test.com' } },
+             as: :json
+
+        expect(response).to have_http_status(:success)
+        expect(response.body).to include('API Inbox')
+      end
+
+      it 'creates a line inbox when administrator' do
+        post "/api/v1/accounts/#{account.id}/inboxes",
+             headers: admin.create_new_auth_token,
+             params: { name: 'Line Inbox',
+                       channel: { type: 'line', line_channel_id: SecureRandom.uuid, line_channel_secret: SecureRandom.uuid,
+                                  line_channel_token: SecureRandom.uuid } },
+             as: :json
+
+        expect(response).to have_http_status(:success)
+        expect(response.body).to include('Line Inbox')
+      end
     end
   end
 
diff --git a/spec/controllers/webhooks/line_controller_spec.rb b/spec/controllers/webhooks/line_controller_spec.rb
new file mode 100644
index 000000000..1c91ca0eb
--- /dev/null
+++ b/spec/controllers/webhooks/line_controller_spec.rb
@@ -0,0 +1,12 @@
+require 'rails_helper'
+
+RSpec.describe 'Webhooks::LineController', type: :request do
+  describe 'POST /webhooks/line/{:line_channel_id}' do
+    it 'call the line events job with the params' do
+      allow(Webhooks::LineEventsJob).to receive(:perform_later)
+      expect(Webhooks::LineEventsJob).to receive(:perform_later)
+      post '/webhooks/line/line_channel_id', params: { content: 'hello' }
+      expect(response).to have_http_status(:success)
+    end
+  end
+end
diff --git a/spec/factories/channel/channel_line.rb b/spec/factories/channel/channel_line.rb
new file mode 100644
index 000000000..080d6ab11
--- /dev/null
+++ b/spec/factories/channel/channel_line.rb
@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+FactoryBot.define do
+  factory :channel_line, class: 'Channel::Line' do
+    line_channel_id { SecureRandom.uuid }
+    line_channel_secret { SecureRandom.uuid }
+    line_channel_token { SecureRandom.uuid }
+    inbox
+    account
+  end
+end
diff --git a/spec/jobs/send_reply_job_spec.rb b/spec/jobs/send_reply_job_spec.rb
index b7c27974b..94c7663f2 100644
--- a/spec/jobs/send_reply_job_spec.rb
+++ b/spec/jobs/send_reply_job_spec.rb
@@ -55,5 +55,14 @@ RSpec.describe SendReplyJob, type: :job do
       expect(process_service).to receive(:perform)
       described_class.perform_now(message.id)
     end
+
+    it 'calls ::Line:SendOnLineService when its line message' do
+      line_channel = create(:channel_line)
+      message = create(:message, conversation: create(:conversation, inbox: line_channel.inbox))
+      allow(::Line::SendOnLineService).to receive(:new).with(message: message).and_return(process_service)
+      expect(::Line::SendOnLineService).to receive(:new).with(message: message)
+      expect(process_service).to receive(:perform)
+      described_class.perform_now(message.id)
+    end
   end
 end
diff --git a/spec/jobs/webhooks/line_events_job_spec.rb b/spec/jobs/webhooks/line_events_job_spec.rb
new file mode 100644
index 000000000..10da5602a
--- /dev/null
+++ b/spec/jobs/webhooks/line_events_job_spec.rb
@@ -0,0 +1,38 @@
+require 'rails_helper'
+
+RSpec.describe Webhooks::LineEventsJob, type: :job do
+  subject(:job) { described_class.perform_later(params: params) }
+
+  let!(:line_channel) { create(:channel_line) }
+  let!(:params) { { line_channel_id: line_channel.line_channel_id, 'line' => { test: 'test' } } }
+  let(:post_body) { params.to_json }
+  let(:signature) { Base64.strict_encode64(OpenSSL::HMAC.digest(OpenSSL::Digest.new('SHA256'), line_channel.line_channel_secret, post_body)) }
+
+  it 'enqueues the job' do
+    expect { job }.to have_enqueued_job(described_class)
+      .with(params: params)
+      .on_queue('default')
+  end
+
+  context 'when invalid params' do
+    it 'returns nil when no line_channel_id' do
+      expect(described_class.perform_now(params: {})).to be_nil
+    end
+
+    it 'returns nil when invalid bot_token' do
+      expect(described_class.perform_now(params: { 'line_channel_id' => 'invalid_id', 'line' => { test: 'test' } })).to be_nil
+    end
+  end
+
+  context 'when valid params' do
+    it 'calls Line::IncomingMessageService' do
+      process_service = double
+      allow(Line::IncomingMessageService).to receive(:new).and_return(process_service)
+      allow(process_service).to receive(:perform)
+      expect(Line::IncomingMessageService).to receive(:new).with(inbox: line_channel.inbox,
+                                                                 params: params['line'].with_indifferent_access)
+      expect(process_service).to receive(:perform)
+      described_class.perform_now(params: params, post_body: post_body, signature: signature)
+    end
+  end
+end
diff --git a/spec/services/line/incoming_message_service_spec.rb b/spec/services/line/incoming_message_service_spec.rb
new file mode 100644
index 000000000..06ff3ade3
--- /dev/null
+++ b/spec/services/line/incoming_message_service_spec.rb
@@ -0,0 +1,59 @@
+require 'rails_helper'
+
+describe Line::IncomingMessageService do
+  let!(:line_channel) { create(:channel_line) }
+  let(:params) do
+    {
+      'destination': '2342234234',
+      'events': [
+        {
+          'replyToken': '0f3779fba3b349968c5d07db31eab56f',
+          'type': 'message',
+          'mode': 'active',
+          'timestamp': 1_462_629_479_859,
+          'source': {
+            'type': 'user',
+            'userId': 'U4af4980629'
+          },
+          'message': {
+            'id': '325708',
+            'type': 'text',
+            'text': 'Hello, world'
+          }
+        },
+        {
+          'replyToken': '8cf9239d56244f4197887e939187e19e',
+          'type': 'follow',
+          'mode': 'active',
+          'timestamp': 1_462_629_479_859,
+          'source': {
+            'type': 'user',
+            'userId': 'U4af4980629'
+          }
+        }
+      ]
+    }.with_indifferent_access
+  end
+
+  describe '#perform' do
+    context 'when valid text message params' do
+      it 'creates appropriate conversations, message and contacts' do
+        line_bot = double
+        line_user_profile = double
+        allow(Line::Bot::Client).to receive(:new).and_return(line_bot)
+        allow(line_bot).to receive(:get_profile).and_return(line_user_profile)
+        allow(line_user_profile).to receive(:body).and_return(
+          {
+            'displayName': 'LINE Test',
+            'userId': 'U4af4980629',
+            'pictureUrl': 'https://test.com'
+          }.to_json
+        )
+        described_class.new(inbox: line_channel.inbox, params: params).perform
+        expect(line_channel.inbox.conversations).not_to eq(0)
+        expect(Contact.all.first.name).to eq('LINE Test')
+        expect(line_channel.inbox.messages.first.content).to eq('Hello, world')
+      end
+    end
+  end
+end
diff --git a/spec/services/line/send_on_line_service_spec.rb b/spec/services/line/send_on_line_service_spec.rb
new file mode 100644
index 000000000..117353de1
--- /dev/null
+++ b/spec/services/line/send_on_line_service_spec.rb
@@ -0,0 +1,18 @@
+require 'rails_helper'
+
+describe Line::SendOnLineService do
+  describe '#perform' do
+    context 'when a valid message' do
+      it 'calls @channel.client.push_message' do
+        line_client = double
+        line_channel = create(:channel_line)
+        message = create(:message, message_type: :outgoing, content: 'test',
+                                   conversation: create(:conversation, inbox: line_channel.inbox))
+        allow(line_client).to receive(:push_message)
+        allow(Line::Bot::Client).to receive(:new).and_return(line_client)
+        expect(line_client).to receive(:push_message)
+        described_class.new(message: message).perform
+      end
+    end
+  end
+end