Merge pull request killbill#620 from KBbitsP/v3

Updates about CC fields not showing

Author: pierre

userguide/tutorials/stripe_plugin.adoc

@@ -161,12 +161,27 @@ Next, run the stripe demo application using your Stripe publishable key as follo
 ----
 PUBLISHABLE_KEY=pk_test_XXX ruby app.rb
 ----
+
+NOTE: If the above command gives an error related to Sinatra gem, then it is possible that the Gem is not installed OR there are multiple Ruby versions on the machine. In this case, appropriate version of Ruby (having the gem) needs to be used to run the above command as shown in the below example. 
+
+For Windows specific users, it might complain about not recognized internal or external command. The command shown in the below example might be useful to address this.
+[source, bash]
+----
+H:/jruby-9.3.1.0/bin/jruby app.rb PUBLISHABLE_KEY=pk_test_XXX
+---- 
+
 === Step 8: Test the demo application
 
 In your browser, navigate to \http://localhost:4567/. This displays the following screen:
 
 image::https://github.com/killbill/killbill-docs/raw/v3/userguide/assets/img/tutorials/stripe_integration_demo_app_home.png[align=center]
 
+NOTE: After starting the demo app, if fields like Card number, CVV, Expiry date, Zip Code etc. are not visible, this means that the Stripe object has not initiliased correctly and the publishable key has not been passed/read correctly. In this scenario, publishable key can be set directly in app.rb. Line 5 needs to be replaced as shown in the below example. 
+[source, bash]
+----
+set :publishable_key, ENV['PUBLISHABLE_KEY']|| 'pk_test_XXX'
+---- 
+
 Enter dummy data (4242 4242 4242 4242 as the credit card number, any three digit CVC, any expiry date in the future, and any zip code) and click the  *Buy via Stripe Elements* button. This displays the following confirmation screen:
 
 image::https://github.com/killbill/killbill-docs/raw/v3/userguide/assets/img/tutorials/stripe_integration_confirmation_page.png[align=center]