rcravens/Stripe.com-Wordpress-Plugin — pull request #2 by gdb (2011-12-12 22:30:21+00:00)
Title: When $amount is null, allow client to choose amount

Here's an example of this in action: http://blog.gregbrockman.com/2011/11/stripe-payments-plugin/.

I'm not sure whether there's a better answer for making sure $ is defined than the var $ = jQuery hack.