Hi, I'm hoping you can give me a bit of advice. I bought a top off of eBay, and paid for it straight away on PayPal.
The seller had quoted £3.70 for second class signed for postage.
She then sent me a message saying that she had miscalculated the postage and could I send another 70 pence.
Now, when I sell stuff, if I underestimate the postage, I never go back and ask for more, I would just suck it up and bear the cost myself. If I have accidentally overcharged someone I will do a partial refund to them for the difference. So I think that really I don't 'have' to pay the extra. However, I don't really mind doing it if it makes the transaction go through - it's only 70p for goodness sake.
Anyway, I told her I'd pay but I didn't know 'how' to pay - as in I'd already paid for item on PayPal so I can't pay for it again iyswim.
She asked if I would do a direct back transfer and gave me her bank details. I tried but my bank won't let me transfer less than £1.
So I told her this and gave her my phone no. I said if she gave me her email address I could do a PayPal transfer or she could invoice me directly on PayPal.
She then came back and asked if I would go to a Barclays Bank to pay it over the counter 
By this point my 'goodwill' is starting to subside? I sent her a message saying that I was happy to pay it as a gesture of goodwill but that I wasn't going to go to a bank to do it.
I'm not sure exactly what my question is - I suppose what would you do in my position?