First hit up
https://ordering.yahoo.co.jp/order/wallet_use_contents

This site has a list of all Yahoo! Premium
services you're using(in this case, aucitons.)

Mine is currently blank because I removed Y!P.
Post a screenshot of the URL above(blank out your
card info) and I'll see if I can point out what to
do next.

I know you'll need your Security Key(different
from password.)