I applied for one (ive had them before) last week, and it gave me fits to try and process the payment. When I tried again it told me it was less than 4 days till travel so it couldn't process it. I emailed their support team and they said apply again. Will I still be able to travel with only an application number?

Can't get their helpdesk to answer, if they do they hang up after asking for the application number. Anyone here have any experience with this?