diff --git a/app.rb b/app.rb
index 64cffcb..3853357 100644
--- a/app.rb
+++ b/app.rb
@@ -4,7 +4,6 @@ require 'sinatra-helpers/haml/partials'
 require 'haml'
 require 'lib/models'
 
-
 get '/' do
   @directorates = Directorate.all( :order => ['name'] )
   haml :home
@@ -22,10 +21,10 @@ get '/suppliers/:slug.csv' do
  headers "Content-Disposition" => "attachment;filename=supplier-#{@supplier.slug}.csv",
     "Content-Type" => "application/octet-stream"
 
-  result = "Date,Ref.,Trans No,Directorate,Service,Amount ex. VAT\n"
+  result = "Date,Ref.,URL,Trans No,Directorate,Service,Amount ex. VAT\n"
 
   for payment in @supplier.payments
-    result += "#{payment.d.strftime("%d %b %Y")},#{payment.id},#{payment.trans_no},\"#{payment.directorate.name}\",#{payment.service.name},#{sprintf("%0.2f", payment.amount)}\n"
+    result += "#{payment.d.strftime("%d %b %Y")},#{payment.id},#{payment.url},#{payment.trans_no},\"#{payment.directorate.name}\",#{payment.service.name},#{sprintf("%0.2f", payment.amount)}\n"
   end
 
   result
@@ -49,10 +48,10 @@ get '/services/:slug.csv' do
  headers "Content-Disposition" => "attachment;filename=service-#{@service.slug}.csv",
     "Content-Type" => "application/octet-stream"
 
-  result = "Date,Ref.,Trans No,Directorate,Supplier,Amount ex. VAT\n"
+  result = "Date,Ref.,URL,Trans No,Directorate,Supplier,Amount ex. VAT\n"
 
   for payment in @service.payments
-    result += "#{payment.d.strftime("%d %b %Y")},#{payment.id},#{payment.trans_no},\"#{payment.directorate.name}\",#{payment.supplier.name},#{sprintf("%0.2f", payment.amount)}\n"
+    result += "#{payment.d.strftime("%d %b %Y")},#{payment.id},#{payment.url},#{payment.trans_no},\"#{payment.directorate.name}\",#{payment.supplier.name},#{sprintf("%0.2f", payment.amount)}\n"
   end
 
   result
diff --git a/lib/models.rb b/lib/models.rb
index 2118b0e..294f97b 100644
--- a/lib/models.rb
+++ b/lib/models.rb
@@ -4,6 +4,8 @@ require 'dm-validations'
 require 'dm-timestamps'
 require 'dm-aggregates'
 
+SITE_URL = 'http://armchairauditor.heroku.com/'
+
 class Payment
   include DataMapper::Resource
   
@@ -20,6 +22,10 @@ class Payment
   belongs_to :directorate
   belongs_to :service
   belongs_to :supplier
+  
+  def url
+    SITE_URL + "payments/" + @id.to_s
+  end
 end