title: Paypal recurring payment but not monthly
body: <p>I want to build a website where the buyer subscribes to my product, that's not monthy but quarterly. I have two questions:</p>
  
  <ul>
  <li>Is it possible to set up a quarterly payment, so that the user subscribes but gets charged every three months?</li>
  <li>Is it possible to set up a 'pay per thing' payment, so that the user accepts the subscription but is only charged when I, the seller, push a button or similar.</li>
  </ul>
  
  <p>For the latter one, an example: Let's say I publish every three months. I published, I click "charge!" and it charges my subscribers. Three months go by and I can't publish yet, so I won't click "charge!" until next month.</p>
  
  <p>Are those questions answerable? Are them possible?</p>
  
  <p>Thanks.</p>