title: Need to combine consumable and non-reniewing subscription in one purchase
body: <p>I need to combine two types of the app-purchases in one item -- for example my purchase should be:</p>
  
  <pre><code>5 bananas / 6 months 
  </code></pre>
  
  <p>So I can buy 5 bananas in my app, but I can eat/use them only for 6 months. </p>
  
  <p>How can I implement this? Is it a normal usage of the purchases? Thx.</p>