Hello Roberto,
Thank you for your question about renewing your authorization. To remedy this issue, you just need to follow the instructions given. Go to your BidSlammer Preferences page and click the link to "Renew Authorization."
The only way we know for this step to be required is if the customer revokes the authorization at eBay. If you follow the step above, it will work properly.
Please let us know if you have any other questions, or require other assistance. We are happy to help.
bidslammer