IAB Doc Fix: Error in code snippet

  // Note that the developer payload is optional.

  if (mDeveloperPayload != null) {

    request.putString(DEVELOPER_PAYLOAD, mDeveloperPayload);

  }

  Bundle response = mService.sendBillingRequest(request);

  // Do something with this response.

  }

</pre>

<p>The <code>makeRequestBundle()</code> method constructs an initial Bundle, which contains the

three keys that are required for all requests: <code>BILLING_REQUEST</code>,