[Plugin: WP Stripe] Hard-code the price?

Thanks for making this easy-to-use plugin. I’m selling just one product, so Swipe would be a great solution for me. Instead of making the donation amount up to the user, how can I set the amount to a specific amount? I don’t see any options for changing the form…

Thanks,

http://ww.wp.xz.cn/extend/plugins/wp-stripe/