What a eBay order writes
One invoice per order, in draft, in your currency.
Each eBay order becomes one draft invoice in Xero: the buyer matched or created as a contact by name and email, one line per item at the price actually paid, and the order’s own currency. It lands as a draft so you approve it in Xero the way you approve anything else; nothing is posted to your accounts behind your back.
eBay does not announce a sale, so we find it on our next check, up to two minutes later, and the draft invoice follows straight after. Cancel the order before you approve the invoice and the draft is removed. Anything you have already approved is yours to credit in Xero.