title: Currently available more than one custom data field?
body: <p><a href="https://developer.surveymonkey.com/mashery/send_flow" rel="nofollow">https://developer.surveymonkey.com/mashery/send_flow</a> only seems to note one custom_id field, but the website displays up to six. Are these available to add data to or coming in the future? We are in need of one more field in our current integration. Thanks</p>