title: Updating a users email address in MailChimp API V3
body: <p>I am running the following code (I've hidden ID's) to update a subscriber's email address in a MailChimp list:</p>
  
  <pre><code>$mailchimp-&gt;patch('lists/1234567/members/' . md5('test@test.com'), [
      'email_address' =&gt; 'new-email@newtest.com',
      'status' =&gt; 'subscribed',
      'merge_fields' =&gt; array(
          'FNAME' =&gt; 'Ben',
          'LNAME' =&gt; 'Sinclair',
      ),
  ]);
  </code></pre>
  
  <p>It does not seem to work. I do not receive any errors, it just does nothing. </p>
  
  <p>How do you update an email address in a MailChimp list using API V3?</p>