Sending an invoice??

[booksnstuff_8]

A buyer wants me to send an invoice for two auctions that have ended, but when I tried to eBay sends me the following message:

"Error

We can't process your request due to one of the following reasons:

Buyer has already paid for the invoice.

The item is no longer available for checkout after 30 days since last created."

What should I do??

[missjen831]

Did the buyer pay for one or both of the items? You can’t send an invoice after the buyer has paid.