title: Update quickbooks invoice with php
body: <p>We need to update a single invoice in quickbooks online using PHP (CakePHP 1.3). I've looked around and the only thing I've been able to find is the "keith palmer php api" which seems a bit over kill for the simple nature of what we are trying to accomplish.</p>
  
  <p>Has anyone accomplished this? I don't imagine it would take more than a simple curl execution to quickbooks to update an invoice? Please advise.</p>