factory method for PosMobile service (#268)

Author: angelov

lib/adyen/client.rb

@@ -287,6 +287,10 @@ def terminal_cloud_api
       @terminal_cloud_api ||= Adyen::TerminalCloudAPI.new(self)
     end
 
+    def pos_mobile
+      @pos_mobile ||= Adyen::PosMobile.new(self)
+    end
+
     private
 
     def auth_header(auth_type, faraday)

spec/client_spec.rb

@@ -272,4 +272,10 @@
     expect(client.service_url('TerminalCloudAPI', 'connectedTerminals', nil))
     .to eq('https://terminal-api-test.adyen.com/connectedTerminals')
   end
+
+  it 'checks the creation of PosMobile sessions url' do
+    client = Adyen::Client.new(api_key: 'api_key', env: :test)
+    expect(client.service_url('PosMobile', 'sessions', nil))
+      .to eq('https://checkout-test.adyen.com/checkout/possdk/sessions')
+  end
 end