Plexo: Update Network Token implementation (#5169)

Description
-------------------------
[SER-1377](https://spreedly.atlassian.net/browse/SER-1377)

This commit update the previous implementation of NT in order to use
network token instead if card

Unit test
-------------------------
Finished in 0.033159 seconds.

25 tests, 137 assertions, 0 failures, 0 errors, 0 pendings, 0 omissions, 0 notifications
100% passed

753.94 tests/s, 4131.61 assertions/s

Remote test
-------------------------
Finished in 47.41717 seconds.

32 tests, 62 assertions, 0 failures, 0 errors, 0 pendings, 3 omissions, 0 notifications
100% passed

0.67 tests/s, 1.31 assertions/s

Rubocop
-------------------------
798 files inspected, no offenses detected

Co-authored-by: Javier Pedroza <jpedroza@spreedly.com>

lib/active_merchant/billing/gateways/plexo.rb

@@ -196,19 +196,48 @@ def add_invoice_number(post, options)
       end
 
       def add_payment_method(post, payment, options)
-        post[:paymentMethod] = {}
+        payment_method = build_payment_method(payment)
 
-        if payment&.is_a?(CreditCard)
-          post[:paymentMethod][:type] = 'card'
-          post[:paymentMethod][:Card] = {}
-          post[:paymentMethod][:Card][:Number] = payment.number
-          post[:paymentMethod][:Card][:ExpMonth] = format(payment.month, :two_digits) if payment.month
-          post[:paymentMethod][:Card][:ExpYear] = format(payment.year, :two_digits) if payment.year
-          post[:paymentMethod][:Card][:Cvc] = payment.verification_value if payment.verification_value
+        if payment_method.present?
+          add_card_holder(payment_method[:NetworkToken] || payment_method[:Card], payment, options)
+          post[:paymentMethod] = payment_method
+        end
+      end
 
-          add_card_holder(post[:paymentMethod][:Card], payment, options)
+      def build_payment_method(payment)
+        case payment
+        when NetworkTokenizationCreditCard
+          {
+            source: 'network-token',
+            id: payment.brand,
+            NetworkToken: {
+              Number: payment.number,
+              Bin: get_last_eight_digits(payment.number),
+              Last4: get_last_four_digits(payment.number),
+              ExpMonth: (format(payment.month, :two_digits) if payment.month),
+              ExpYear: (format(payment.year, :two_digits) if payment.year),
+              Cryptogram: payment.payment_cryptogram
+            }
+          }
+        when CreditCard
+          {
+            type: 'card',
+            Card: {
+              Number: payment.number,
+              ExpMonth: (format(payment.month, :two_digits) if payment.month),
+              ExpYear: (format(payment.year, :two_digits) if payment.year),
+              Cvc: payment.verification_value
+            }
+          }
         end
-        post[:paymentMethod][:Card][:Cryptogram] = payment.payment_cryptogram if payment&.is_a?(NetworkTokenizationCreditCard)
+      end
+
+      def get_last_eight_digits(number)
+        number[-8..-1]
+      end
+
+      def get_last_four_digits(number)
+        number[-4..-1]
       end
 
       def add_card_holder(card, payment, options)

test/remote/gateways/remote_plexo_test.rb

@@ -24,7 +24,8 @@ def setup
       },
       identification_type: '1',
       identification_value: '123456',
-      billing_address: address
+      billing_address: address,
+      invoice_number: '12345abcde'
     }
 
     @cancel_options = {
@@ -41,10 +42,22 @@ def setup
         month: '12',
         year: Time.now.year
     })
+
+    @decrypted_network_token = NetworkTokenizationCreditCard.new(
+      {
+        first_name: 'Joe', last_name: 'Doe',
+        brand: 'visa',
+        payment_cryptogram: 'UnVBR0RlYm42S2UzYWJKeWJBdWQ=',
+        number: '5555555555554444',
+        source: :network_token,
+        month: '12',
+        year: Time.now.year
+      }
+    )
   end
 
   def test_successful_purchase_with_network_token
-    response = @gateway.purchase(@amount, @network_token_credit_card, @options.merge({ invoice_number: '12345abcde' }))
+    response = @gateway.purchase(@amount, @decrypted_network_token, @options.merge({ invoice_number: '12345abcde' }))
     assert_success response
     assert_equal 'You have been mocked.', response.message
   end

test/unit/gateways/plexo_test.rb

@@ -346,9 +346,9 @@ def test_purchase_with_network_token
       assert_equal request['Amount']['Currency'], 'UYU'
       assert_equal request['Amount']['Details']['TipAmount'], '5'
       assert_equal request['Flow'], 'direct'
-      assert_equal @network_token_credit_card.number, request['paymentMethod']['Card']['Number']
-      assert_equal @network_token_credit_card.payment_cryptogram, request['paymentMethod']['Card']['Cryptogram']
-      assert_equal @network_token_credit_card.first_name, request['paymentMethod']['Card']['Cardholder']['FirstName']
+      assert_equal @network_token_credit_card.number, request['paymentMethod']['NetworkToken']['Number']
+      assert_equal @network_token_credit_card.payment_cryptogram, request['paymentMethod']['NetworkToken']['Cryptogram']
+      assert_equal @network_token_credit_card.first_name, request['paymentMethod']['NetworkToken']['Cardholder']['FirstName']
     end.respond_with(successful_network_token_response)
 
     assert_success purchase