title: In the BillingService module, what needs to be modified to increase security?
body: <p>The comment for the class <a href="http://developer.android.com/guide/market/billing/billing_integrate.html#billing-service" rel="noreferrer">BillingService</a> recommends that:</p>
  
  <blockquote>
    <p>You should modify and obfuscate this code before using it.</p>
  </blockquote>
  
  <p>OK, but <strong>what</strong> must be modified?</p>
  
  <p>The class name? The TAG used for logging? Method names and data members? The logic and program flow itself? Other?</p>
  
  <p>In other words, I can understand the need for obfuscation, but how can I get away with implementing the recommendation <em>without rewriting everything from scratch</em> (potentially with bugs that are worse than not modifying anything)?</p>