A thread appeared yesterday on the Facebook Developers Forum looking for beta testers for their upcoming payment system.

Facebook has a great opportunity here to compete with PayPal and other online merchant providers. I hope that the transaction fees are minimal because I think Facebook is a great place to try implementing micropayment options which isn't easy to do with the high costs of a normal credit card merchant account.

If you want to get a head start on using this service follow the instructions in the forum post to apply to the program. To be included in the program you will have to sign an NDA.