I have no idea, but if you accept credit card payment for registration at your meetings, it'd be a good idea to check out this month's MeCo chat, led by Jim Lewis of Best Meetings Inc. Here's some more info from the e-mail announcement:
James "Jim" Louis' experience flows into the technology area of meeting planning, website management, online registration and association management. Jim has been a presenter at the MSAE Technology Expo in 2006 and 2007 on the topics of On/Offline Registration Systems, Smart Phone Selection & Useful Tools and Online Community Building. Jim is employed by Best Meetings Inc. out of Bloomington, MN.
November 27th in the MeCo Chat room
November 28th at the MeCo Mansion in Second life
1:00 - 2:00 PM PST
4:00 - 5:00 PM EST on both days