Payment: Refund Request

A "Refund Request" requests that a payment be refunded manually. This can be used for payment methods that do
not support refunds, such as konbini. To support non-refundable payment methods, a bank account must be
specified so that we know where to send the funds. Since it is a manual process, the refund will be carried
out at a later date, and there's a possibility of it being rejected.