Two big developments in WSN Classifieds yesterday (actually in all the scripts but Classifieds users are most likely to be interested), expanding the type of sales websites you can use it for.

First, I've added quantity tracking. When enabled, the listing submitter and set a quantity of the product they have available. Whenever a purchase is processed through WSN's system (paypal/2co/etc IPNs) it automatically deducts one from the available quantity. It will even work for payments sent to listing submitters if the purchase is through paypal, since WSN's generated paypal button for that sets the IPN to call back to WSN. The default (but configurable) action is for the listing to automatically hide itself when the quantity hits 0. This will be useful for any site that sells less than an infinite number of each item -- even if you only sell 1 of each, enabling quantities will allow the listing to autohide after being purchased.

I've also added an auctions system. When enabled, the listing submitter can select to make their listing an auction which will last a number of days they specify (configurable default is 7 days). The price field then acts as the minimum starting bid. Any logged in member can then place a bid, which must be at least 10 cents more than the current leading bid. The configurable default is to autohide the listing after the auction completes, and of course it emails the winner to ask them to make payment and emails the seller to tell them who won, and gives both of them the other's email address to facilitate communication.

These are of course fresh experimental features at the moment, do let me know if you find any probelms or have any ideas to enhance these systems.