title: Clear postman collection variables after datafile collection runner has completed
body: <p><strong>Set-up:</strong>
  I have a Postman collection that uses a Data-file to loop through placing orders for approx. 60 new products (using a productId guid). To set-up this I have to first create two access_tokens, and a new transactionId, all of which are saved as collection variables.</p>
  <p>I also have a “SetNextRequest” step which will bypass these three steps if the variables are populated, meaning they are only run once for each datafile run, rather than running for each new product.</p>
  <pre><code>if (pm.collectionVariables.get(“createdTransactionId”)) {
  postman.setNextRequest(“Order01: Order submission”)
  }
  </code></pre>
  <p><strong>Issue.</strong>
  How can I clear these variables when the entire datafile has run, rather than clearing the variables when each new product is placed (which is what I have currently).</p>
  <p>Ideally I would have a “clear variables” step at the beginning of the “loop”, but I only want it to run once at the very start of the run.</p>
  <p>Any suggestions would be appreciated.</p>