view portion of adding a column almost complete, then backend logic

app/controllers/pay_controller.rb

@@ -1,7 +1,12 @@
 class PayController < ApplicationController
   
   def index
-    
+  end
+  
+  def update_dd_info
+    respond_to do |format|
+      format.json {render :json => {:hello => :world} }
+    end
   end
   
 end