"You may not use Southwest's sites for or in connection with offering any third party product or service not authorized or approved by Southwest. For example, online check-in service providers may not use Southwest web pages to check-in Customers online or attempt to obtain for them a boarding pass in any certain boarding group."
http://www.southwest.com/html/about-southwest/terms-and-cond...
Which sucks, because your product looks really cool. (And I'd forego paying $10 to use your service... which is probably why it's banned. :P)
http://www.southwest.com/flight/early-bird-retrieve-reservat...
Southwest Airlines automatically reserves a boarding pass for A-List Members beginning 36 hours prior to scheduled departure of the Member's confirmed Southwest Airlines flight.