added fix for disputeService

Author: DjoykeAbyah

lib/adyen/client.rb

@@ -53,6 +53,7 @@ def live_url_prefix=(value)
 
     # base URL for API given service and @env
     def service_url_base(service)
+      service = 'DisputesService' if service == 'Disputes'
       if @env == :mock
         @mock_service_url_base
       else

spec/client_spec.rb

@@ -278,4 +278,10 @@
     expect(client.service_url('PosMobile', 'sessions', nil))
       .to eq('https://checkout-test.adyen.com/checkout/possdk/sessions')
   end
+
+  it 'correctly maps Disputes to DisputesService and generates valid URL' do
+    client = Adyen::Client.new(env: :test)
+    expect(client.service_url_base('Disputes'))
+      .to eq('https://ca-test.adyen.com/ca/services/DisputesService')
+  end  
 end