With the addition of eBay checkout support, we can now properly process the fixed price best offer purchases that are not immediate payment transactions. The functionality to submit fixed price listings with Best Offer and Immediate Payment will be added in the March 2011 update.

More information on Immediate Payment can be found at the following link:

http://ssc.ChannelAdvisor.com/howto/using-immediate-payment-option-ebay

More information on the eBay Checkout can be found on the SSC at the links below:

http://ssc.ChannelAdvisor.com/howto/marketplaces/ebay-marketplace/enabli...

http://ssc.ChannelAdvisor.com/howto/marketplaces/ebay-marketplace/using-...