MercadoPago: Sending sponsor_id only on production

Summary:
------------------------------
MercadoPago only sending platform/partnership info on production.

Remote Test:
------------------------------
Finished in 79.263845 seconds.
20 tests, 56 assertions, 0 failures, 0 errors, 0 pendings,
1 omissions, 0 notifications
100% passed

Unit Tests:
------------------------------
Finished in 68.455283 seconds.
6012 tests, 80277 assertions, 0 failures, 0 errors, 0 pendings,
0 omissions, 0 notifications
100% passed

RuboCop:
------------------------------
801 files inspected, no offenses detected

lib/active_merchant/billing/gateways/mercado_pago.rb

@@ -137,7 +137,7 @@ def add_merchant_services(post, options)
       end
 
       def add_additional_data(post, options)
-        post[:sponsor_id] = options[:sponsor_id]
+        post[:sponsor_id] = options[:sponsor_id] unless test?
         post[:metadata] = options[:metadata] if options[:metadata]
         post[:device_id] = options[:device_id] if options[:device_id]
         post[:additional_info] = {

test/remote/gateways/remote_mercado_pago_test.rb

@@ -394,4 +394,18 @@ def test_successful_purchase_with_3ds
     assert_equal response.params['three_ds_info']['external_resource_url'], 'https://api.mercadopago.com/cardholder_authenticator/v2/prod/browser-challenges'
     assert_include response.params['three_ds_info'], 'creq'
   end
+
+  def test_successful_purchase_with_3ds_mandatory
+    three_ds_cc = credit_card('5031755734530604', verification_value: '123', month: 11, year: 2025)
+    @options[:execute_threed] = true
+    @options[:three_ds_mode] = 'mandatory'
+
+    response = @gateway.purchase(290, three_ds_cc, @options)
+
+    assert_success response
+    assert_equal 'pending_challenge', response.message
+    assert_include response.params, 'three_ds_info'
+    assert_equal response.params['three_ds_info']['external_resource_url'], 'https://api.mercadopago.com/cardholder_authenticator/v2/prod/browser-challenges'
+    assert_include response.params['three_ds_info'], 'creq'
+  end
 end

test/unit/gateways/mercado_pago_test.rb

@@ -529,6 +529,28 @@ def test_set_binary_mode_to_nil_when_request_is_3ds
     end.respond_with(successful_authorize_response)
   end
 
+  def test_should_not_include_sponsor_id_when_test_mode_is_enabled
+    @options[:sponsor_id] = '1234'
+
+    stub_comms do
+      @gateway.purchase(@amount, @credit_card, @options)
+    end.check_request do |endpoint, data, _headers|
+      assert_not_match(%r("sponsor_id":), data) if /payments/.match?(endpoint)
+    end.respond_with(successful_purchase_response)
+  end
+
+  def test_should_include_sponsor_id_when_test_mode_is_disabled
+    @gateway.stubs(test?: false)
+    @options[:sponsor_id] = '1234'
+
+    stub_comms do
+      @gateway.purchase(@amount, @credit_card, @options)
+    end.check_request do |endpoint, data, _headers|
+      request = JSON.parse(data)
+      assert_equal '1234', request['sponsor_id'] if /payments/.match?(endpoint)
+    end.respond_with(successful_purchase_response)
+  end
+
   private
 
   def pre_scrubbed