anchor.diff:  
   We will assume:
   
  -* You have Ruby 2.1+ or JRuby 1.7.11+ installed. This requirement is only to simplify the installation using https://github.com/killbill/killbill-cloud/tree/master/kpm[KPM]. Alternatively, you can install Kill Bill manually by following the http://killbill.io/userguide/platform-userguide/[userguide]
  +* You already went through the Getting started tutorial
  +* You have MySQL installed and have created a killbill database
   * You have http://curl.haxx.se/[cURL] installed. This is only to be able to run the examples from this tutorial. In practice, your application will use one of our http://killbill.io/userguide/[client libraries]
  -* You have MySQL installed and have created a killbill database
   
   [[setup]]
   == Setup
  
positive.code: 
  Kill Bill will return a 302 Found on success. The customer should be redirected to the url specified in the Location header, e.g. https://www.paypal.com/cgi-bin/webscr?cmd=_express-checkout&token=EC-20G53990M6953444J.
  
  
  Follow the link to log to the paypal site: On the PayPal site, the user will be guided through the approval process to create a token for your website.
  
  Once that step is completed, the customer comes back from the PayPal flow, you can now create the payment method in Kill Bill by specifyfing the token that was returned in the setup-checkout step (EC-20G53990M6953444J). Note that this token is now associated to the customer that was redirected to Paypal and that accepted the agreement.
  
  
  [source,bash]
  
negative.code: 
  === Creating accounts
  
  We will assume that users going to your site have to create an account in your system. When they do, you will need to create a mirrored account in Kill Bill. This will let you do things like retrieve all payments for a given user, etc.
  
  While your website will issue an API call to do it, let's simply use http://127.0.0.1:3000/accounts/new[Kaui] in this tutorial to create the account manually.
  
  Notes:
  
  * The externalKey should map to the unique id of the account in your system
  * There are many more fields you can store (phone number, address, etc.) -- all of them are optional
  
  === Storing payment methods
  
  