1) Cover the standard 2.6% from paypal. Make that obvious. 2) Add a flat rate on top to cover operating expenses. The current model makes a lot of sense for sm

1) Cover the standard 2.6% from paypal. Make that obvious. 2) Add a flat rate on top to cover operating expenses. The current model makes a lot of sense for small to medium amount transactions but I too have a problem with 7.6% total of a much larger transaction this company didn't do any extra work for. Alternatively you could have multiple rates based on the size of the payload. If you're really using their storage, which I doubt, then that percentage cost would cover the bandwidth to serve it. With that you would have people like me that would check their work though, to make sure if I'm really paying bandwidth costs, you better not be leveraging Dropbox's infrastructure for that too. Personally, I do like the idea over a Zapier though that's a flat monthly fee. I couldn't possibly determine if the monthly rate is enough on principle but a cut of my profits is much less of an "up front" cost I can't adequately measure yet.