I had an interesting one today with eBay’s ripoff Simple Delivery prepaid labels.
Took the package to the post office, showed them the qr code, which they rejected due to the cost being insufficient to cover the postage. Had to pay the total amount myself & was told to contact eBay.
Been going around & around with unhelpful chatbot, no help, no human support.
Think I’ll go back to selling at a boot market in future!