Stripe is a new payment processor on the Web, and they seem to be a lot less insane than Paypal. On a whim, I made a little (almost completely untested, toy) CL library for accessing their HTTP API from Lisp. Maybe you’ll find it useful: cl-stripe.
This was pretty great fun! Thanks to their nice HTTP API, drakma, and alexandria, I have been able to write this with a minimum of horribly hacky code, in just 5 or 6 hours of working on it, on and off, this saturday afternoon.
If it still looks like fun, I think I may add some clucumber tests to it tomorrow. Stay tuned.