You must ask buyers to confirm delivery extension by sending shipping extension request as soon as someone buy your product. If they don't confirm, cancel the sale and buyer will get back the refund. Otherwise, you have to deliver goods in 7 days as per eBay policy.
Even the listing will be different from normal. Better go through tutorials or talk/chat with eBay Customer Care for more details.
God Luck
🙂
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Graphit India - A ***** Shop
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