title: Is there a way to search for transactions by custom field?
body: <p>I store specific custom field for each transaction. I'd like to conduct a search by this field. I wouldn't like to retrieve too many transactions (can filter by payment method id, but still) and iterate through them on application side. So, I read a documentation, didn't find an ability to search by custom field (only by predefined). I didn't try it out, but probably it's possibly to do so by following the same pattern like</p>
  
  <pre><code>var stream = gateway.transaction.search(function (search) {
      search.myCustomField().is("custom_field_value");
      // or search.customFields.myCustomField().is("custom_field_value");
  });
  </code></pre>
  
  <p>Thanks in advance</p>