The translation API key on the nostr.wine store page is only displayed on the order menu and can’t be retrieved after paying it.

Let’s say you copy the api to the clipboard. The next page is a lightning invoice where one of the options is to copy the invoice, thus if the user choses that option (sometimes out of muscle memory paying btcpay invoices) it will overwrite the clipboard contents with the API key.

Now this can be avoided if you pay attention to what you are doing but I suspect most users will lose the APIs in the first attempt. Happened with me.