Hi all. 4 days ago on another Id I accepted an offer & sold an item. It is unpaid & I was preparing to open an upaid item case. However, this morning I received this message from the buyer:

'I will buy a $50 eBay gift card tomorrow or Sunday to pay off this item.'

I have no idea what this means? And I'm unsure how to respond politely to the message. 

I would really appreciate any help to understand it - I hope he doesn't want to send me an ebay gift card as I certainly don't want one- and if he can afford the $50 why doesn't he just pay me the $27 that he owes me? 

(BTW,sorry if these are silly questions, but I've never come across anything like this before.)

TIA