I'm building a site that needs to allow users to pay other users without us, the company hosting the site, getting involved. My first thought was paypal but I thought it may be a good idea to ask the community if there are any good options that I'm missing. Any suggestions?
You could also look at Amazon Flexible Payments, it looks like it was designed for the sort of use-case you are talking about. I would like to hear of people's experiences with it though.<p>It's coefficient of friction looks to be roughly similar to Paypal's and it's API seems reasonable. I've looked at it quite closely in the past.