The authorization for gixen for work with eBay has nothing to do with paying for the extra feature of the mirror service. If your authorization for gixen to work with eBay is expiring or has expired that's a completely different thing.
Log in to your gixen account, click on settings, scroll down and check the status of the authorization for your gixen account to work with eBay. If your authorization has expired or is close to expiring click on the button to renew it and follow instructions from there. There is no cost to do this and it's absolutely necessary for gixen to place bids.