After buyer paid for the item, how can I charge for postage?

Hi, I soid the item and buyer paid for this.

It was collection in person, but as buyer's request, I dicided to post.

Could you tell me how could I send invoice after item was paid.

 

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If you're going to comply with eBay's seller protection (ie. send using trackable postage) you should only accept a single payment.   So you'd need to refund and re-invoice.

If item is cheapish and you're not going to use trackable postage you can just send a money request for the extra amount using Paypal.Me in your Paypal account.