During one of hackathons my team got first place. After that we quit our jobs and studies, joined accelerator, launched real product and after a year got ~$110k funding.
Dropbox and Google Drive made uploading file super easy. You just drag&drop file on your hard drive and they take care about the rest. In addition to that, whenever you are going to update the file, you don't have to login. Again just drag&drop and Dropbox + Sellbox do the magic.
There are plans of integrating that. However, Stripe is limited only to US market, so still looking for better worldwide (at least US and Europe) solution.