1. Enable PayPal Sandbox mode
PayPal sandbox is a way to test the classifieds using test transactions
With that enabled it still tries to use the regular PayPal site sop testing transactions doesnt work.
2. Delete listings if they expire
That doesnt seem to wok either, I made some test auctions with buy it now options and when I used the buy it now the auctions ended as youd expect but theyyre still listed in the category. I'm thinking it might have to do with time settings... when you set an unlimited auction and someone wins it the time left etc is still displayed as unlimited. Same with lets say a 24hr auction for example, I listed one bought it out so its closed but still shows 23hrs and change as time left.
Hope all that just made sense...