CyberSource: Add line_items for authorize method

Added `line_items` field to be passed in for authorize method in cyber
source implementation.

CE-2240

Remote:
101 tests, 520 assertions, 6 failures, 0 errors, 0 pendings, 0 omissions, 0 notifications
94.0594% passed

Unit:
5023 tests, 74856 assertions, 0 failures, 0 errors, 0 pendings, 0 omissions, 0 notifications
100% passed

Rubocop:
725 files inspected, no offenses detected

Closes #4268

CHANGELOG

@@ -75,6 +75,7 @@
 * CheckoutV2: Add support for Apple Pay and Google Pay tokens [AMHOL] #4235
 * Decidir Plus: Update payment reference [naashton] #4271
 * Paysafe: Update redact method [meagabeth] #4269
+* CyberSource: Add `line_items` field in authorize method [ajawadmirza] #4268
 
 == Version 1.124.0 (October 28th, 2021)
 * Worldpay: Add Support for Submerchant Data on Worldpay [almalee24] #4147

lib/active_merchant/billing/gateways/cyber_source.rb

@@ -290,7 +290,7 @@ def check_billing_field_value(default, submitted)
       def build_auth_request(money, creditcard_or_reference, options)
         xml = Builder::XmlMarkup.new indent: 2
         add_customer_id(xml, options)
-        add_payment_method_or_subscription(xml, money, creditcard_or_reference, options)
+        add_payment_method_or_subscription(xml, money, creditcard_or_reference, options, true)
         add_threeds_2_ucaf_data(xml, creditcard_or_reference, options)
         add_decision_manager_fields(xml, options)
         add_mdd_fields(xml, options)
@@ -500,6 +500,8 @@ def extract_option(prioritized_options, option_name)
       end
 
       def add_line_item_data(xml, options)
+        return unless options[:line_items]
+
         options[:line_items].each_with_index do |value, index|
           xml.tag! 'item', { 'id' => index } do
             xml.tag! 'unitPrice', localized_amount(value[:declared_value].to_i, options[:currency] || default_currency)
@@ -879,7 +881,7 @@ def add_check_payment_method(xml)
         end
       end
 
-      def add_payment_method_or_subscription(xml, money, payment_method_or_reference, options)
+      def add_payment_method_or_subscription(xml, money, payment_method_or_reference, options, include_items = false)
         if payment_method_or_reference.is_a?(String)
           add_purchase_data(xml, money, true, options)
           add_installments(xml, options)
@@ -892,6 +894,7 @@ def add_payment_method_or_subscription(xml, money, payment_method_or_reference,
         else
           add_address(xml, payment_method_or_reference, options[:billing_address], options)
           add_address(xml, payment_method_or_reference, options[:shipping_address], options, true)
+          add_line_item_data(xml, options) if include_items
           add_purchase_data(xml, money, true, options)
           add_installments(xml, options)
           add_creditcard(xml, payment_method_or_reference)

test/unit/gateways/cyber_source_test.rb

@@ -418,6 +418,19 @@ def test_successful_credit_card_tax_request_with_amounts
     end.respond_with(successful_tax_response)
   end
 
+  def test_successful_credit_card_authorize_request_with_line_items
+    stub_comms do
+      @gateway.authorize(@amount, @credit_card, @options)
+    end.check_request do |_endpoint, data, _headers|
+      doc = REXML::Document.new(data)
+      REXML::XPath.each(doc, '//item') do |item|
+        request_item = @options[:line_items][item.attributes['id'].to_i]
+        assert_match(request_item[:tax_amount], item.get_elements('taxAmount')[0].text)
+        assert_match(request_item[:national_tax], item.get_elements('nationalTax')[0].text)
+      end
+    end.respond_with(successful_tax_response)
+  end
+
   def test_successful_credit_card_capture_request
     @gateway.stubs(:ssl_post).returns(successful_authorization_response, successful_capture_response)
     assert response = @gateway.authorize(@amount, @credit_card, @options)