diff --git a/bin/rspec b/bin/rspec
new file mode 100755
index 000000000..a6c78521d
--- /dev/null
+++ b/bin/rspec
@@ -0,0 +1,29 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+#
+# This file was generated by Bundler.
+#
+# The application 'rspec' is installed as part of a gem, and
+# this file is here to facilitate running it.
+#
+
+require "pathname"
+ENV["BUNDLE_GEMFILE"] ||= File.expand_path("../../Gemfile",
+  Pathname.new(__FILE__).realpath)
+
+bundle_binstub = File.expand_path("../bundle", __FILE__)
+
+if File.file?(bundle_binstub)
+  if File.read(bundle_binstub, 300) =~ /This file was generated by Bundler/
+    load(bundle_binstub)
+  else
+    abort("Your `bin/bundle` was not generated by Bundler, so this binstub cannot run.
+Replace `bin/bundle` by running `bundle binstubs bundler --force`, then run this command again.")
+  end
+end
+
+require "rubygems"
+require "bundler/setup"
+
+load Gem.bin_path("rspec-core", "rspec")
diff --git a/lib/netsuite.rb b/lib/netsuite.rb
index dbe6b3eb1..baff263f0 100644
--- a/lib/netsuite.rb
+++ b/lib/netsuite.rb
@@ -191,11 +191,18 @@ module Records
     autoload :Invoice,                          'netsuite/records/invoice'
     autoload :InvoiceItem,                      'netsuite/records/invoice_item'
     autoload :InvoiceItemList,                  'netsuite/records/invoice_item_list'
+    autoload :ItemAvailability,                 'netsuite/records/item_availability'
     autoload :ItemFulfillment,                  'netsuite/records/item_fulfillment'
     autoload :ItemFulfillmentItem,              'netsuite/records/item_fulfillment_item'
     autoload :ItemFulfillmentItemList,          'netsuite/records/item_fulfillment_item_list'
     autoload :ItemFulfillmentPackage,           'netsuite/records/item_fulfillment_package'
     autoload :ItemFulfillmentPackageList,       'netsuite/records/item_fulfillment_package_list'
+    autoload :ItemFulfillmentPackageFedEx,      'netsuite/records/item_fulfillment_package_fed_ex'
+    autoload :ItemFulfillmentPackageUps,        'netsuite/records/item_fulfillment_package_ups'
+    autoload :ItemFulfillmentPackageUsps,       'netsuite/records/item_fulfillment_package_usps'
+    autoload :ItemFulfillmentPackageFedExList,  'netsuite/records/item_fulfillment_package_fed_ex_list'
+    autoload :ItemFulfillmentPackageUpsList,    'netsuite/records/item_fulfillment_package_ups_list'
+    autoload :ItemFulfillmentPackageUspsList,   'netsuite/records/item_fulfillment_package_usps_list'
     autoload :ItemGroup,                        'netsuite/records/item_group'
     autoload :ItemMember,                       'netsuite/records/item_member'
     autoload :ItemMemberList,                   'netsuite/records/item_member_list'
diff --git a/lib/netsuite/actions/get_select_value.rb b/lib/netsuite/actions/get_select_value.rb
index f4938f7b2..15147e086 100644
--- a/lib/netsuite/actions/get_select_value.rb
+++ b/lib/netsuite/actions/get_select_value.rb
@@ -25,7 +25,7 @@ def success?
       end
 
       def response_body
-        @response_body ||= response_hash[:base_ref_list]
+        @response_body ||= response_hash[:base_ref_list] || {base_ref: []}
       end
 
       def response_hash
diff --git a/lib/netsuite/configuration.rb b/lib/netsuite/configuration.rb
index 936cbb247..1a8dc1bd1 100644
--- a/lib/netsuite/configuration.rb
+++ b/lib/netsuite/configuration.rb
@@ -11,7 +11,7 @@ def reset!
     end
 
     def attributes
-      @attributes ||= {}
+      Thread.current[:netsuite_configuration] ||= {}
     end
 
     def connection(params={}, credentials={})
@@ -21,7 +21,7 @@ def connection(params={}, credentials={})
         read_timeout: read_timeout,
         open_timeout: open_timeout,
         namespaces: namespaces,
-        soap_header: auth_header(credentials).update(soap_header),
+        soap_header: auth_header(credentials).merge(soap_header),
         pretty_print_xml: true,
         filters: filters,
         logger: logger,
@@ -50,11 +50,12 @@ def filters=(list)
     end
 
     def wsdl_cache
-      @wsdl_cache ||= {}
+      Thread.current[:netsuite_wsdl_cache] ||= {}
+
     end
 
     def clear_wsdl_cache
-      @wsdl_cache = {}
+      Thread.current[:netsuite_wsdl_cache] = {}
     end
 
     def cached_wsdl
@@ -185,6 +186,18 @@ def auth_header(credentials={})
         token_auth(credentials)
       else
         user_auth(credentials)
+      end.merge(application_info_header(credentials))
+    end
+
+    def application_info_header(credentials={})
+      if credentials[:application_id].blank?
+        {}
+      else
+        {
+          'platformMsgs:ApplicationInfo' => {
+            'platformMsgs:applicationId' => credentials[:application_id]
+          }
+        }
       end
     end
 
diff --git a/lib/netsuite/records/item_availability.rb b/lib/netsuite/records/item_availability.rb
new file mode 100644
index 000000000..2e42ae1bc
--- /dev/null
+++ b/lib/netsuite/records/item_availability.rb
@@ -0,0 +1,51 @@
+module NetSuite
+  module Records
+    class ItemAvailability
+      include Support::Fields
+      include Support::RecordRefs
+      include Support::Records
+
+      field :item, InventoryItem
+      field :location_id, Location
+      alias_method :location, :location_id
+
+      field :quantity_on_hand
+      field :on_hand_value_mli
+      field :reorder_point
+      field :quantity_on_order
+      field :quantity_committed
+      field :quantity_available
+
+      def initialize(attributes = {})
+        initialize_from_attributes_hash(attributes)
+      end
+
+      def self.get_for_inventory_items(items, credentials={})
+        ref_list = NetSuite::Records::RecordRefList.new(
+          record_ref: items.map do |item|
+            {internal_id: item.internal_id}
+          end
+        )
+        connection = NetSuite::Configuration.connection({}, credentials)
+        response = connection.call :get_item_availability, message: {
+          "platformMsgs:itemAvailabilityFilter" => {
+            "platformCore:item" => ref_list.to_record
+          }
+        }
+        return false unless response.success?
+
+        result = response.body[:get_item_availability_response][:get_item_availability_result]
+        unless result[:status][:@is_success] == "true"
+          return false
+        end
+        if result[:item_availability_list]
+          result[:item_availability_list][:item_availability].map do |row|
+            NetSuite::Records::ItemAvailability.new(row)
+          end
+        else
+          []
+        end
+      end
+    end
+  end
+end
diff --git a/lib/netsuite/records/item_fulfillment.rb b/lib/netsuite/records/item_fulfillment.rb
index b903c7f23..ed9265afd 100644
--- a/lib/netsuite/records/item_fulfillment.rb
+++ b/lib/netsuite/records/item_fulfillment.rb
@@ -26,6 +26,9 @@ class ItemFulfillment
 
       field :item_list,                ItemFulfillmentItemList
       field :package_list,             ItemFulfillmentPackageList
+      field :package_fed_ex_list,      ItemFulfillmentPackageFedExList      
+      field :package_ups_list,         ItemFulfillmentPackageUpsList
+      field :package_usps_list,        ItemFulfillmentPackageUspsList
       field :custom_field_list,        CustomFieldList
 
       attr_reader   :internal_id
diff --git a/lib/netsuite/records/item_fulfillment_package_fed_ex.rb b/lib/netsuite/records/item_fulfillment_package_fed_ex.rb
new file mode 100644
index 000000000..48e8f1446
--- /dev/null
+++ b/lib/netsuite/records/item_fulfillment_package_fed_ex.rb
@@ -0,0 +1,28 @@
+module NetSuite
+  module Records
+    class ItemFulfillmentPackageFedEx
+      include Support::Fields
+      include Support::Records
+      include Namespaces::TranSales
+
+      fields :authorization_number_fed_ex, :cod_amount_fed_ex, :dry_ice_weight_fed_ex, :insured_value_fed_ex, :is_alcohol_fed_ex, 
+              :is_non_haz_lithium_fed_ex, :is_non_standard_container_fed_ex, :package_height_fed_ex, :package_length_fed_ex, 
+              :package_tracking_number_fed_ex, :package_weight_fed_ex, :package_width_fed_ex, :priority_alert_content_fed_ex, 
+              :reference1_fed_ex, :signature_releasefed_ex, :use_cod_fed_ex, :use_insured_value_fed_ex
+
+
+      def initialize(attributes_or_record = {})
+        case attributes_or_record
+        when Hash
+          initialize_from_attributes_hash(attributes_or_record)
+        when self.class
+          initialize_from_record(attributes_or_record)
+        end
+      end
+
+      def initialize_from_record(record)
+        self.attributes = record.send(:attributes)
+      end
+    end
+  end
+end
diff --git a/lib/netsuite/records/item_fulfillment_package_fed_ex_list.rb b/lib/netsuite/records/item_fulfillment_package_fed_ex_list.rb
new file mode 100644
index 000000000..070f97b13
--- /dev/null
+++ b/lib/netsuite/records/item_fulfillment_package_fed_ex_list.rb
@@ -0,0 +1,32 @@
+module NetSuite
+  module Records
+    class ItemFulfillmentPackageFedExList
+      include Support::Fields
+      include Support::Records
+      include Namespaces::TranSales
+
+      fields :package_fed_ex
+
+      def initialize(attributes = {})
+        initialize_from_attributes_hash(attributes)
+      end
+
+      def package_fed_ex=(packages)
+        case packages
+        when Hash
+          self.packages << ItemFulfillmentPackageFedEx.new(packages)
+        when Array
+          packages.each { |package| self.packages << ItemFulfillmentPackageFedEx.new(package) }
+        end
+      end
+
+      def packages
+        @packages ||= []
+      end
+
+      def to_record
+        { "#{record_namespace}:packageFedEx" => packages.map(&:to_record) }
+      end
+    end
+  end
+end
diff --git a/lib/netsuite/records/item_fulfillment_package_ups.rb b/lib/netsuite/records/item_fulfillment_package_ups.rb
new file mode 100644
index 000000000..235292080
--- /dev/null
+++ b/lib/netsuite/records/item_fulfillment_package_ups.rb
@@ -0,0 +1,27 @@
+module NetSuite
+  module Records
+    class ItemFulfillmentPackageUps
+      include Support::Fields
+      include Support::Records
+      include Namespaces::TranSales
+
+      fields :additional_handling_ups, :cod_amount_ups, :cod_method_ups, :delivery_conf_ups, :insured_value_ups, :package_descr_ups,
+        :package_height_ups, :package_length_ups, :package_tracking_number_ups, :package_weight_ups, :package_width_ups,
+        :packaging_ups, :reference1_ups, :reference2_ups, :use_cod_ups
+
+
+      def initialize(attributes_or_record = {})
+        case attributes_or_record
+        when Hash
+          initialize_from_attributes_hash(attributes_or_record)
+        when self.class
+          initialize_from_record(attributes_or_record)
+        end
+      end
+
+      def initialize_from_record(record)
+        self.attributes = record.send(:attributes)
+      end
+    end
+  end
+end
diff --git a/lib/netsuite/records/item_fulfillment_package_ups_list.rb b/lib/netsuite/records/item_fulfillment_package_ups_list.rb
new file mode 100644
index 000000000..22b0455d4
--- /dev/null
+++ b/lib/netsuite/records/item_fulfillment_package_ups_list.rb
@@ -0,0 +1,32 @@
+module NetSuite
+  module Records
+    class ItemFulfillmentPackageUpsList
+      include Support::Fields
+      include Support::Records
+      include Namespaces::TranSales
+
+      fields :package_ups
+
+      def initialize(attributes = {})
+        initialize_from_attributes_hash(attributes)
+      end
+
+      def package_ups=(packages)
+        case packages
+        when Hash
+          self.packages << ItemFulfillmentPackageUps.new(packages)
+        when Array
+          packages.each { |package| self.packages << ItemFulfillmentPackageUps.new(package) }
+        end
+      end
+
+      def packages
+        @packages ||= []
+      end
+
+      def to_record
+        { "#{record_namespace}:packageUps" => packages.map(&:to_record) }
+      end
+    end
+  end
+end
diff --git a/lib/netsuite/records/item_fulfillment_package_usps.rb b/lib/netsuite/records/item_fulfillment_package_usps.rb
new file mode 100644
index 000000000..e8df42da1
--- /dev/null
+++ b/lib/netsuite/records/item_fulfillment_package_usps.rb
@@ -0,0 +1,26 @@
+module NetSuite
+  module Records
+    class ItemFulfillmentPackageUsps
+      include Support::Fields
+      include Support::Records
+      include Namespaces::TranSales
+
+      fields :insured_value_usps, :package_descr_usps, :package_height_usps, :package_length_usps,
+              :package_tracking_number_usps, :package_weight_usps, :package_width_usps, :reference1_usps, :reference2_usps, :use_insured_value_usps
+
+
+      def initialize(attributes_or_record = {})
+        case attributes_or_record
+        when Hash
+          initialize_from_attributes_hash(attributes_or_record)
+        when self.class
+          initialize_from_record(attributes_or_record)
+        end
+      end
+
+      def initialize_from_record(record)
+        self.attributes = record.send(:attributes)
+      end
+    end
+  end
+end
diff --git a/lib/netsuite/records/item_fulfillment_package_usps_list.rb b/lib/netsuite/records/item_fulfillment_package_usps_list.rb
new file mode 100644
index 000000000..0daa01622
--- /dev/null
+++ b/lib/netsuite/records/item_fulfillment_package_usps_list.rb
@@ -0,0 +1,32 @@
+module NetSuite
+  module Records
+    class ItemFulfillmentPackageUspsList
+      include Support::Fields
+      include Support::Records
+      include Namespaces::TranSales
+
+      fields :package_usps
+
+      def initialize(attributes = {})
+        initialize_from_attributes_hash(attributes)
+      end
+
+      def package_usps=(packages)
+        case packages
+        when Hash
+          self.packages << ItemFulfillmentPackageUsps.new(packages)
+        when Array
+          packages.each { |package| self.packages << ItemFulfillmentPackageUsps.new(package) }
+        end
+      end
+
+      def packages
+        @packages ||= []
+      end
+
+      def to_record
+        { "#{record_namespace}:packageUsps" => packages.map(&:to_record) }
+      end
+    end
+  end
+end
diff --git a/lib/netsuite/records/sales_order_item.rb b/lib/netsuite/records/sales_order_item.rb
index 0b659a5ea..2a8a09c11 100644
--- a/lib/netsuite/records/sales_order_item.rb
+++ b/lib/netsuite/records/sales_order_item.rb
@@ -17,7 +17,8 @@ class SalesOrderItem
         :rev_rec_start_date, :rev_rec_term_in_months, :serial_numbers,
         :shipping_cost, :tax1_amt, :tax_rate1, :tax_rate2,
         :vsoe_allocation, :vsoe_amount, :vsoe_deferral,
-        :vsoe_delivered, :vsoe_permit_discount, :vsoe_price
+        :vsoe_delivered, :vsoe_permit_discount, :vsoe_price,
+        :ship_group
 
       field :custom_field_list, CustomFieldList
 
diff --git a/lib/netsuite/utilities.rb b/lib/netsuite/utilities.rb
index 7708857cd..b0cc1c982 100644
--- a/lib/netsuite/utilities.rb
+++ b/lib/netsuite/utilities.rb
@@ -177,6 +177,7 @@ def get_item(ns_item_internal_id, opts = {})
       ns_item ||= NetSuite::Utilities.get_record(NetSuite::Records::ServiceResaleItem, ns_item_internal_id, opts)
       ns_item ||= NetSuite::Utilities.get_record(NetSuite::Records::GiftCertificateItem, ns_item_internal_id, opts)
       ns_item ||= NetSuite::Utilities.get_record(NetSuite::Records::KitItem, ns_item_internal_id, opts)
+      ns_item ||= NetSuite::Utilities.get_record(NetSuite::Records::ItemGroup, ns_item_internal_id, opts)
       ns_item ||= NetSuite::Utilities.get_record(NetSuite::Records::SerializedInventoryItem, ns_item_internal_id, opts)
       ns_item ||= NetSuite::Utilities.get_record(NetSuite::Records::SerializedAssemblyItem, ns_item_internal_id, opts)
       ns_item ||= NetSuite::Utilities.get_record(NetSuite::Records::LotNumberedAssemblyItem, ns_item_internal_id, opts)
diff --git a/lib/netsuite/version.rb b/lib/netsuite/version.rb
index ecf1526e5..68d9365d5 100644
--- a/lib/netsuite/version.rb
+++ b/lib/netsuite/version.rb
@@ -1,3 +1,3 @@
 module NetSuite
-  VERSION = '0.8.12'
+  VERSION = '0.10.0'
 end
diff --git a/netsuite.gemspec b/netsuite.gemspec
index 9102e627f..c4e954f62 100644
--- a/netsuite.gemspec
+++ b/netsuite.gemspec
@@ -20,5 +20,5 @@ Gem::Specification.new do |gem|
   gem.add_dependency 'savon', '>= 2.3.0'
 
   gem.add_development_dependency 'rspec', '~> 3.11.0'
-  gem.add_development_dependency 'rake', '~> 12.3.3'
+  gem.add_development_dependency 'rake', '~> 13.0.6'
 end
diff --git a/spec/netsuite/records/item_fulfillment_package_fed_ex_list_spec.rb b/spec/netsuite/records/item_fulfillment_package_fed_ex_list_spec.rb
new file mode 100644
index 000000000..165ac3dae
--- /dev/null
+++ b/spec/netsuite/records/item_fulfillment_package_fed_ex_list_spec.rb
@@ -0,0 +1,27 @@
+require 'spec_helper'
+
+describe NetSuite::Records::ItemFulfillmentPackageFedExList do
+  let(:list) { NetSuite::Records::ItemFulfillmentPackageFedExList.new }
+
+  it 'has a packages attribute' do
+    expect(list.packages).to be_kind_of(Array)
+  end
+
+  describe '#to_record' do
+    before do
+      list.packages << NetSuite::Records::ItemFulfillmentPackageFedEx.new(
+        :package_tracking_number_fed_ex => '1Z12354645757686786'
+      )
+    end
+
+    it 'can represent itself as a SOAP record' do
+      record = {
+          'tranSales:packageFedEx' => [
+            'tranSales:packageTrackingNumberFedEx' => '1Z12354645757686786'
+          ]
+        }
+      
+      expect(list.to_record).to eql(record)
+    end
+  end
+end
diff --git a/spec/netsuite/records/item_fulfillment_package_ups_list_spec.rb b/spec/netsuite/records/item_fulfillment_package_ups_list_spec.rb
new file mode 100644
index 000000000..d98473551
--- /dev/null
+++ b/spec/netsuite/records/item_fulfillment_package_ups_list_spec.rb
@@ -0,0 +1,27 @@
+require 'spec_helper'
+
+describe NetSuite::Records::ItemFulfillmentPackageUpsList do
+  let(:list) { NetSuite::Records::ItemFulfillmentPackageUpsList.new }
+
+  it 'has a packages attribute' do
+    expect(list.packages).to be_kind_of(Array)
+  end
+
+  describe '#to_record' do
+    before do
+      list.packages << NetSuite::Records::ItemFulfillmentPackageUps.new(
+        :package_tracking_number_ups => '1Z12354645757686786'
+      )
+    end
+
+    it 'can represent itself as a SOAP record' do
+      record = {
+          'tranSales:packageUps' => [
+            'tranSales:packageTrackingNumberUps' => '1Z12354645757686786'
+          ]
+        }
+      
+      expect(list.to_record).to eql(record)
+    end
+  end
+end
diff --git a/spec/netsuite/records/item_fulfillment_package_usps_list_spec.rb b/spec/netsuite/records/item_fulfillment_package_usps_list_spec.rb
new file mode 100644
index 000000000..1a9516cbd
--- /dev/null
+++ b/spec/netsuite/records/item_fulfillment_package_usps_list_spec.rb
@@ -0,0 +1,27 @@
+require 'spec_helper'
+
+describe NetSuite::Records::ItemFulfillmentPackageUspsList do
+  let(:list) { NetSuite::Records::ItemFulfillmentPackageUspsList.new }
+
+  it 'has a packages attribute' do
+    expect(list.packages).to be_kind_of(Array)
+  end
+
+  describe '#to_record' do
+    before do
+      list.packages << NetSuite::Records::ItemFulfillmentPackageUsps.new(
+        :package_tracking_number_usps => '1Z12354645757686786'
+      )
+    end
+
+    it 'can represent itself as a SOAP record' do
+      record = {
+          'tranSales:packageUsps' => [
+            'tranSales:packageTrackingNumberUsps' => '1Z12354645757686786'
+          ]
+        }
+      
+      expect(list.to_record).to eql(record)
+    end
+  end
+end