Don’t.  The system is massively buggy and the company is completely unresponsive to complaints.

The web UI looks like it everything is nice and automated, but in reality you will end up doing a bunch of stuff by hand.  Examples of bugs and/or dumb design that have already driven us crazy:

• If you have a bunch of outstanding invoices that you want to cancel, the bulk select/action doesn’t work.  No error or anything: it just doesn’t do anything, silently.|

• They use lazy loading to show just a dozen or so invoices at a time, with the rest showing only after you scroll down (like Facebook, Twitter, etc.)  If you try to do a search or filter, that works only on the invoices that are currently being displayed, not the full set: presumably resulting from a design decision to make the filter work within the client rather than the server.

• Thanks to a flaky implementation of lazy loading itself, some invoices will appear as duplicates.

It’s pretty clear that Elon Musk has left the building.