diff --git a/examples/audience_summary.rb b/examples/audience_estimate.rb
similarity index 91%
rename from examples/audience_summary.rb
rename to examples/audience_estimate.rb
index 6eb69c29..aa88dbc0 100644
--- a/examples/audience_summary.rb
+++ b/examples/audience_estimate.rb
@@ -41,5 +41,5 @@
   ]
 }
 
-audience_summary = TwitterAds::AudienceSummary.fetch(account, params)
-puts audience_summary
+audience_estimate = TwitterAds::AudienceEstimate.fetch(account, params)
+puts audience_estimate
diff --git a/lib/twitter-ads.rb b/lib/twitter-ads.rb
index ea706324..824874f0 100644
--- a/lib/twitter-ads.rb
+++ b/lib/twitter-ads.rb
@@ -37,6 +37,7 @@
 require 'twitter-ads/campaign/line_item'
 require 'twitter-ads/campaign/promotable_user'
 require 'twitter-ads/campaign/targeting_criteria'
+require 'twitter-ads/campaign/tracking_tags'
 require 'twitter-ads/campaign/tweet'
 require 'twitter-ads/campaign/organic_tweet'
 require 'twitter-ads/campaign/iab_category'
@@ -75,7 +76,7 @@
 require 'twitter-ads/creative/tweet_previews'
 require 'twitter-ads/creative/tweets'
 
-require 'twitter-ads/targeting/audience_summary'
+require 'twitter-ads/targeting/audience_estimate'
 
 require 'twitter-ads/measurement/web_event_tag'
 require 'twitter-ads/measurement/app_event_tag'
diff --git a/lib/twitter-ads/account.rb b/lib/twitter-ads/account.rb
index df49ff1e..45959c8e 100644
--- a/lib/twitter-ads/account.rb
+++ b/lib/twitter-ads/account.rb
@@ -10,7 +10,6 @@ class Account
 
     property :id, read_only: true
     property :name, read_only: true
-    property :salt, read_only: true
     property :timezone, read_only: true
     property :timezone_switch_at, type: :time, read_only: true
     property :created_at, type: :time, read_only: true
@@ -218,6 +217,23 @@ def line_items(id = nil, opts = {})
       load_resource(LineItem, id, opts)
     end
 
+    # Returns a collection of tracking tags available to the
+    # current account.
+    #
+    # @param id [String] The LineItem ID value.
+    # @param opts [Hash] A Hash of extended options.
+    # @option opts [Boolean] :with_deleted Indicates if deleted items should be included.
+    # @option opts [String] :sort_by The object param to sort the API response by.
+    # @option opts [String] :line_item_ids The object param to sort the API response by.
+    # @option opts [String] :tracking_tag_ids The object param to sort the API response by.
+    #
+    # @return A Cursor or object instance.
+    #
+    # @since 10.0.0
+    def tracking_tags(id = nil, opts = {})
+      load_resource(TrackingTag, id, opts)
+    end
+
     # Returns a collection of app lists available to the current account.
     #
     # @param id [String] The AppList ID value.
diff --git a/lib/twitter-ads/campaign/line_item.rb b/lib/twitter-ads/campaign/line_item.rb
index c1e9990b..1a347d67 100644
--- a/lib/twitter-ads/campaign/line_item.rb
+++ b/lib/twitter-ads/campaign/line_item.rb
@@ -19,7 +19,6 @@ class LineItem < Analytics
     property :advertiser_domain
     property :android_app_store_identifier
     property :audience_expansion
-    property :automatically_select_bid
     property :bid_amount_local_micro
     property :bid_strategy
     property :campaign_id
@@ -39,7 +38,6 @@ class LineItem < Analytics
 
     # beta (not yet generally available)
     property :advertiser_user_id
-    property :tracking_tags
 
     # sdk only
     property :to_delete, type: :bool
@@ -94,5 +92,8 @@ def targeting_criteria(id = nil, opts = {})
       id ? TargetingCriteria.load(account, id, opts) : TargetingCriteria.all(account, @id, opts)
     end
 
+    def tracking_tags(id = nil, opts = {})
+      id ? TrackingTag.load(account, id, opts) : TrackingTag.all(account, @id, opts)
+    end
   end
 end
diff --git a/lib/twitter-ads/campaign/tracking_tags.rb b/lib/twitter-ads/campaign/tracking_tags.rb
new file mode 100644
index 00000000..a0af83f7
--- /dev/null
+++ b/lib/twitter-ads/campaign/tracking_tags.rb
@@ -0,0 +1,97 @@
+# frozen_string_literal: true
+# Copyright (C) 2019 Twitter, Inc.
+
+module TwitterAds
+  class TrackingTag
+
+    include TwitterAds::DSL
+    include TwitterAds::Resource
+    include TwitterAds::Persistence
+
+    attr_reader :account
+
+    property :id, read_only: true
+    property :deleted, type: :bool, read_only: true
+    property :created_at, type: :time, read_only: true
+    property :updated_at, type: :time, read_only: true
+
+    property :line_item_id
+    property :tracking_tag_type
+    property :tracking_tag_url
+
+    # sdk only
+    property :to_delete, type: :bool
+
+    RESOURCE_COLLECTION  = "/#{TwitterAds::API_VERSION}/" \
+                           'accounts/%{account_id}/tracking_tags' # @api private
+    RESOURCE             = "/#{TwitterAds::API_VERSION}/" \
+                           'accounts/%{account_id}/tracking_tags/%{id}' # @api private
+
+    def initialize(account)
+      @account = account
+      self
+    end
+
+    # Creates a new Tracking Tag
+    #
+    # @param line_item_id [String] The line item id to create tags for.
+    # @param tracking_tag_url [String] tracking tag URL.
+    #
+    # @return [self] Returns the instance refreshed from the API
+    def create(line_item_id, tracking_tag_url)
+      resource = self.class::RESOURCE_COLLECTION % { account_id: account.id }
+      params = to_params.merge!(
+        line_item_id: line_item_id,
+        tracking_tag_url: tracking_tag_url,
+        tracking_tag_type: 'IMPRESSION_TAG'
+      )
+      response = Request.new(account.client, :post, resource, params: params).perform
+      from_response(response.body[:data])
+    end
+
+    class << self
+
+      # Returns a Cursor instance for a given resource.
+      #
+      # @param account [Account] The Account object instance.
+      # @param line_item_ids [String] A String or String array of Line Item IDs.
+      # @param opts [Hash] An optional Hash of extended options.
+      # @option opts [Boolean] :with_deleted Indicates if deleted items should be included.
+      # @option opts [String] :sort_by The object param to sort the API response by.
+      #
+      # @return [Cursor] A Cusor object ready to iterate through the API response.
+      #
+      # @since 0.3.1
+      # @see Cursor
+      # @see https://dev.twitter.com/ads/basics/sorting Sorting
+      def all(account, line_item_ids, opts = {})
+        if !line_item_ids.empty?
+          params = { line_item_ids: Array(line_item_ids).join(',') }.merge!(opts)
+        end
+        resource = RESOURCE_COLLECTION % { account_id: account.id }
+        request = Request.new(account.client, :get, resource, params: params)
+        Cursor.new(self, request, init_with: [account])
+      end
+
+      # Returns an object instance for a given resource.
+      #
+      # @param account [Account] The Account object instance.
+      # @param id [String] The ID of the specific object to be loaded.
+      # @param opts [Hash] An optional Hash of extended options.
+      # @option opts [Boolean] :with_deleted Indicates if deleted items should be included.
+      # @option opts [String] :sort_by The object param to sort the API response by.
+      #
+      # @return [self] The object instance for the specified resource.
+      #
+      # @since 0.3.1
+      def load(account, id, opts = {})
+        params   = { with_deleted: true }.merge!(opts)
+        resource = RESOURCE % { account_id: account.id, id: id }
+        response = Request.new(account.client, :get, resource, params: params).perform
+        new(account).from_response(response.body[:data])
+      end
+
+    end
+
+  end
+end
diff --git a/lib/twitter-ads/client.rb b/lib/twitter-ads/client.rb
index a179f520..aec0e996 100644
--- a/lib/twitter-ads/client.rb
+++ b/lib/twitter-ads/client.rb
@@ -3,7 +3,7 @@
 
 module TwitterAds
 
-  API_VERSION = '9'
+  API_VERSION = '10'
 
   # The Ads API Client class which functions as a
   # container for basic API consumer information.
diff --git a/lib/twitter-ads/creative/cards_fetch.rb b/lib/twitter-ads/creative/cards_fetch.rb
index a29b07c9..1a4d1a0c 100644
--- a/lib/twitter-ads/creative/cards_fetch.rb
+++ b/lib/twitter-ads/creative/cards_fetch.rb
@@ -35,10 +35,8 @@ class CardsFetch
       property :image, read_only: true
       property :image_display_height, read_only: true
       property :image_display_width, read_only: true
-      property :ipad_app_id, read_only: true
-      property :ipad_deep_link, read_only: true
-      property :iphone_app_id, read_only: true
-      property :iphone_deep_link, read_only: true
+      property :ios_app_store_identifier, read_only: true
+      property :ios_deep_link, read_only: true
       property :name, read_only: true
       property :recipient_user_id, read_only: true
       property :second_choice, read_only: true
diff --git a/lib/twitter-ads/creative/image_app_download_card.rb b/lib/twitter-ads/creative/image_app_download_card.rb
index 58d6a43e..bb95726b 100644
--- a/lib/twitter-ads/creative/image_app_download_card.rb
+++ b/lib/twitter-ads/creative/image_app_download_card.rb
@@ -26,10 +26,8 @@ class ImageAppDownloadCard
       property :app_cta
       property :googleplay_app_id
       property :googleplay_deep_link
-      property :iphone_app_id
-      property :iphone_deep_link
-      property :ipad_app_id
-      property :ipad_deep_link
+      property :ios_app_store_identifier
+      property :ios_deep_link
       property :name
       property :media_key
 
diff --git a/lib/twitter-ads/creative/video_app_download_card.rb b/lib/twitter-ads/creative/video_app_download_card.rb
index cadea730..9038b24b 100644
--- a/lib/twitter-ads/creative/video_app_download_card.rb
+++ b/lib/twitter-ads/creative/video_app_download_card.rb
@@ -25,10 +25,8 @@ class VideoAppDownloadCard
       property :country_code
       property :app_cta
       property :poster_media_key
-      property :ipad_app_id
-      property :ipad_deep_link
-      property :iphone_app_id
-      property :iphone_deep_link
+      property :ios_app_store_identifier
+      property :ios_deep_link
       property :googleplay_app_id
       property :googleplay_deep_link
       property :name
diff --git a/lib/twitter-ads/enum.rb b/lib/twitter-ads/enum.rb
index 8d3be480..9eb42361 100644
--- a/lib/twitter-ads/enum.rb
+++ b/lib/twitter-ads/enum.rb
@@ -84,6 +84,7 @@ module BidStrategy
 
     module PayBy
       APP_CLICK = 'APP_CLICK'
+      IMPRESSION = 'IMPRESSION'
     end
 
     module MetricGroup
diff --git a/lib/twitter-ads/targeting/audience_summary.rb b/lib/twitter-ads/targeting/audience_estimate.rb
similarity index 90%
rename from lib/twitter-ads/targeting/audience_summary.rb
rename to lib/twitter-ads/targeting/audience_estimate.rb
index aeef35fc..4a3dcfbb 100644
--- a/lib/twitter-ads/targeting/audience_summary.rb
+++ b/lib/twitter-ads/targeting/audience_estimate.rb
@@ -2,13 +2,13 @@
 # Copyright (C) 2019 Twitter, Inc.
 
 module TwitterAds
-  module AudienceSummary
+  module AudienceEstimate
 
     include TwitterAds::DSL
     include TwitterAds::Resource
 
     RESOURCE = "/#{TwitterAds::API_VERSION}/" \
-                           'accounts/%{account_id}/audience_summary'
+                           'accounts/%{account_id}/audience_estimate'
 
     property :audience_size, read_only: true
 
@@ -17,7 +17,7 @@ class << self
       # Get an audience summary for the specified targeting criteria.
       #
       # @example
-      #   TwitterAds::AudienceSummary.fetch(
+      #   TwitterAds::AudienceEstimate.fetch(
       #     account,
       #     params: {targeting_criteria:[{targeting_type:'LOCATION',
       #             targeting_value:'96683cc9126741d1'}]}
diff --git a/lib/twitter-ads/version.rb b/lib/twitter-ads/version.rb
index b70e79db..6378c96c 100644
--- a/lib/twitter-ads/version.rb
+++ b/lib/twitter-ads/version.rb
@@ -2,5 +2,5 @@
 # Copyright (C) 2019 Twitter, Inc.
 
 module TwitterAds
-  VERSION = '9.0.0'
+  VERSION = '10.0.0'
 end
diff --git a/spec/fixtures/accounts_all.json b/spec/fixtures/accounts_all.json
index d2656991..7ab5ba1c 100644
--- a/spec/fixtures/accounts_all.json
+++ b/spec/fixtures/accounts_all.json
@@ -9,7 +9,6 @@
       "timezone_switch_at": "2014-11-17T08:00:00Z",
       "id": "2iqph",
       "created_at": "2015-03-04T10:50:42Z",
-      "salt": "5ab2pizq7qxjjqrx3z67f4wbko61o7xs",
       "updated_at": "2015-04-11T05:20:08Z",
       "approval_status": "ACCEPTED",
       "deleted": false
@@ -20,7 +19,6 @@
       "timezone_switch_at": "2014-11-17T08:00:00Z",
       "id": "pz6ec",
       "created_at": "2015-05-29T00:52:16Z",
-      "salt": "39ku32xvhdt0jax8thps2c70e2fv3yok",
       "updated_at": "2015-05-29T00:52:16Z",
       "approval_status": "ACCEPTED",
       "deleted": false
@@ -31,7 +29,6 @@
       "timezone_switch_at": "2014-11-17T08:00:00Z",
       "id": "j9ozo",
       "created_at": "2015-05-01T12:08:10Z",
-      "salt": "winwfne3y6oyikl4tm84bj9r50waxj37",
       "updated_at": "2015-05-01T12:08:10Z",
       "approval_status": "ACCEPTED",
       "deleted": false
@@ -42,7 +39,6 @@
       "timezone_switch_at": "2014-11-17T08:00:00Z",
       "id": "9ttgd",
       "created_at": "2015-06-24T18:51:20Z",
-      "salt": "tj9hmt5xylm5zztrq05w7hwh4mkpkg5r",
       "updated_at": "2015-06-26T06:13:24Z",
       "approval_status": "ACCEPTED",
       "deleted": false
@@ -53,7 +49,6 @@
       "timezone_switch_at": "2013-05-22T07:00:00Z",
       "id": "47d0v",
       "created_at": "2015-05-28T05:42:03Z",
-      "salt": "1ms1mq1nww7zl7169865gwqt89s9127m",
       "updated_at": "2015-05-28T05:42:03Z",
       "approval_status": "ACCEPTED",
       "deleted": false
diff --git a/spec/fixtures/accounts_load.json b/spec/fixtures/accounts_load.json
index 411fd689..84044ad8 100644
--- a/spec/fixtures/accounts_load.json
+++ b/spec/fixtures/accounts_load.json
@@ -6,7 +6,6 @@
     "timezone_switch_at": "2014-11-17T08:00:00Z",
     "id": "2iqph",
     "created_at": "2015-03-04T10:50:42Z",
-    "salt": "5ab2pizq7qxjjqrx3z67f4wbko61o7xs",
     "updated_at": "2015-04-11T05:20:08Z",
     "approval_status": "ACCEPTED",
     "deleted": false
diff --git a/spec/fixtures/audience_summary.json b/spec/fixtures/audience_estimate.json
similarity index 100%
rename from spec/fixtures/audience_summary.json
rename to spec/fixtures/audience_estimate.json
diff --git a/spec/fixtures/line_items_all.json b/spec/fixtures/line_items_all.json
index edd1623f..cc93506a 100644
--- a/spec/fixtures/line_items_all.json
+++ b/spec/fixtures/line_items_all.json
@@ -13,7 +13,6 @@
         "ALL_ON_TWITTER"
       ],
       "bid_amount_local_micro": 2000000,
-      "automatically_select_bid": false,
       "advertiser_domain": null,
       "primary_web_event_tag": null,
       "charge_by": "ENGAGEMENT",
@@ -40,7 +39,6 @@
         "ALL_ON_TWITTER"
       ],
       "bid_amount_local_micro": 2000000,
-      "automatically_select_bid": false,
       "advertiser_domain": null,
       "primary_web_event_tag": null,
       "charge_by": "ENGAGEMENT",
@@ -67,7 +65,6 @@
         "TWITTER_SEARCH"
       ],
       "bid_amount_local_micro": 100000,
-      "automatically_select_bid": false,
       "advertiser_domain": null,
       "primary_web_event_tag": null,
       "charge_by": "ENGAGEMENT",
@@ -94,7 +91,6 @@
         "TWITTER_SEARCH"
       ],
       "bid_amount_local_micro": 500000,
-      "automatically_select_bid": false,
       "advertiser_domain": null,
       "primary_web_event_tag": null,
       "charge_by": "ENGAGEMENT",
@@ -121,7 +117,6 @@
         "TWITTER_TIMELINE"
       ],
       "bid_amount_local_micro": 50000000,
-      "automatically_select_bid": false,
       "advertiser_domain": null,
       "primary_web_event_tag": null,
       "charge_by": "ENGAGEMENT",
@@ -149,7 +144,6 @@
         "TWITTER_TIMELINE"
       ],
       "bid_amount_local_micro": 50000000,
-      "automatically_select_bid": false,
       "advertiser_domain": null,
       "primary_web_event_tag": null,
       "charge_by": "ENGAGEMENT",
@@ -177,7 +171,6 @@
         "TWITTER_SEARCH"
       ],
       "bid_amount_local_micro": 50000000,
-      "automatically_select_bid": false,
       "advertiser_domain": null,
       "primary_web_event_tag": null,
       "charge_by": "ENGAGEMENT",
@@ -204,7 +197,6 @@
         "TWITTER_TIMELINE"
       ],
       "bid_amount_local_micro": 500000,
-      "automatically_select_bid": false,
       "advertiser_domain": null,
       "primary_web_event_tag": null,
       "charge_by": "ENGAGEMENT",
@@ -231,7 +223,6 @@
         "TWITTER_SEARCH"
       ],
       "bid_amount_local_micro": 50000000,
-      "automatically_select_bid": false,
       "advertiser_domain": null,
       "primary_web_event_tag": null,
       "charge_by": "ENGAGEMENT",
@@ -258,7 +249,6 @@
         "TWITTER_TIMELINE"
       ],
       "bid_amount_local_micro": 2009999,
-      "automatically_select_bid": false,
       "advertiser_domain": null,
       "primary_web_event_tag": null,
       "charge_by": "ENGAGEMENT",
diff --git a/spec/fixtures/line_items_load.json b/spec/fixtures/line_items_load.json
index 76174ec1..b78240f8 100644
--- a/spec/fixtures/line_items_load.json
+++ b/spec/fixtures/line_items_load.json
@@ -8,7 +8,6 @@
       "ALL_ON_TWITTER"
     ],
     "bid_amount_local_micro": 2000000,
-    "automatically_select_bid": false,
     "advertiser_domain": null,
     "primary_web_event_tag": null,
     "charge_by": "ENGAGEMENT",
diff --git a/spec/fixtures/tracking_tags_load.json b/spec/fixtures/tracking_tags_load.json
new file mode 100644
index 00000000..8dd7b895
--- /dev/null
+++ b/spec/fixtures/tracking_tags_load.json
@@ -0,0 +1,17 @@
+{
+  "request": {
+    "params": {
+      "tracking_tag_id": "7035",
+      "account_id": "18ce54uhdu0"
+    }
+  },
+  "data": {
+    "line_item_id": "dmbc0",
+    "tracking_tag_url": "https://ad.doubleclick.net/ddm/trackimp/N1234.2061500TWITTER-OFFICIAL/B9156151.125630439;dc_trk_aid=1355;dc_trk_cid=8675309",
+    "tracking_tag_type": "IMPRESSION_TAG",
+    "id": "7035",
+    "created_at": "2021-11-16T00:12:26Z",
+    "updated_at": "2021-11-16T00:12:26Z",
+    "deleted": false
+  }
+}
diff --git a/spec/twitter-ads/campaign/line_item_spec.rb b/spec/twitter-ads/campaign/line_item_spec.rb
index de0c08ad..c3299b70 100644
--- a/spec/twitter-ads/campaign/line_item_spec.rb
+++ b/spec/twitter-ads/campaign/line_item_spec.rb
@@ -40,7 +40,6 @@
     product_type
     placements
     bid_strategy
-    automatically_select_bid
     bid_amount_local_micro
     total_budget_amount_local_micro
     goal
diff --git a/spec/twitter-ads/campaign/tracking_tag_spec.rb b/spec/twitter-ads/campaign/tracking_tag_spec.rb
new file mode 100644
index 00000000..cbe24c00
--- /dev/null
+++ b/spec/twitter-ads/campaign/tracking_tag_spec.rb
@@ -0,0 +1,58 @@
+# frozen_string_literal: true
+# Copyright (C) 2019 Twitter, Inc.
+
+require 'spec_helper'
+
+describe TwitterAds::TrackingTag do
+
+  before(:each) do
+    stub_fixture(:get, :accounts_all, "#{ADS_API}/accounts")
+    stub_fixture(:get, :accounts_load, "#{ADS_API}/accounts/2iqph")
+  end
+
+  let(:client) do
+    Client.new(
+      Faker::Lorem.characters(15),
+      Faker::Lorem.characters(40),
+      "123456-#{Faker::Lorem.characters(40)}",
+      Faker::Lorem.characters(40)
+    )
+  end
+
+  let(:account) { client.accounts.first }
+
+  # check model properties
+  subject { described_class.new(account) }
+  read  = %w(id)
+  write = %w(line_item_id tracking_tag_type tracking_tag_url)
+  include_examples 'object property check', read, write
+
+  describe '#create' do
+
+    let(:tracking_tag) { TwitterAds::TrackingTag.new(account) }
+    let!(:resource) { "#{ADS_API}/accounts/#{account.id}/tracking_tags" }
+    let!(:rel_path) { "/#{TwitterAds::API_VERSION}/accounts/#{account.id}/tracking_tags" }
+
+    before(:each) do
+      stub_fixture(:post, :tracking_tags_load, /#{resource}\?.*/)
+    end
+
+    it 'creates post request with line item ID and url' do
+      line_item_id = 'axe123'
+      tracking_tag_url = 'https://ad.doubleclick.net/ddm/trackimp/N1234.2061500TWITTER-OFFICIAL/B9156151.125630439;dc_trk_aid=1355;dc_trk_cid=8675309'
+      tracking_tag_type = 'IMPRESSION_TAG'
+
+      params = {
+        line_item_id: line_item_id,
+        tracking_tag_url: tracking_tag_url,
+        tracking_tag_type: tracking_tag_type
+      }
+      args = [account.client, :post, rel_path, params: params]
+
+      expect(Request).to receive(:new).with(*args).and_call_original
+      tracking_tag.create(line_item_id, tracking_tag_url)
+    end
+
+  end
+
+end
diff --git a/spec/twitter-ads/targeting/audience_summary_spec.rb b/spec/twitter-ads/targeting/audience_estimate_spec.rb
similarity index 87%
rename from spec/twitter-ads/targeting/audience_summary_spec.rb
rename to spec/twitter-ads/targeting/audience_estimate_spec.rb
index 1e026dc9..cd1e33d0 100644
--- a/spec/twitter-ads/targeting/audience_summary_spec.rb
+++ b/spec/twitter-ads/targeting/audience_estimate_spec.rb
@@ -3,12 +3,12 @@
 
 require 'spec_helper'
 
-describe TwitterAds::AudienceSummary do
+describe TwitterAds::AudienceEstimate do
 
   before(:each) do
     stub_fixture(:get, :accounts_all, "#{ADS_API}/accounts")
     stub_fixture(:get, :accounts_load, "#{ADS_API}/accounts/2iqph")
-    stub_fixture(:post, :audience_summary, "#{ADS_API}/accounts/2iqph/audience_summary")
+    stub_fixture(:post, :audience_estimate, "#{ADS_API}/accounts/2iqph/audience_estimate")
   end
 
   let(:client) do