Specifies the kinds of eligible listings tht the seller prefers to include on Express.
The seller wants all of their eligible listings to appear on Express (in addition to the main eBay site), regardless of the listing format. Only applicable to sellers who are eligible for Express US or Express Germany. (By default, eBay sets this option for every eligible seller.)
The seller only wants their Express format listings to appear on Express. (They don't want their fixed-price and Store Inventory format listings to appear on Express.) Only applicable to sellers who are eligible for Express Germany.
The seller does not want any of their eligible listings to appear on Express. That is, the seller prefers to completely opt out of Express. Only applicable to sellers who are eligible for Express US. (Germany sellers can't use the API to opt out of Express. Germany sellers should see the Express Web site online help for information on how to end their Express qualification.)
Reserved for internal or future use.