Great app I acquired a month ago because I was going to need to be sending quite a number of faxes. I’ve sent over a dozen now, and each time it works great. I just drag-and-drop PDFs of each doc I want to fax. I exclusively use the apps capability for In-app purchases to send a fax, using my iTunes account. On “send" I get prompted to log-in to iTunes, where I approve the purchase, and it’s done seamlessly. $0.99 for up to six pages is pretty good. One 19 page fax was only like $2.99. Sometimes it takes a while (1/2 hour?) to finally get the Fax Sent acknowledgement (and email), but it’s always worked.