You will have no proof of delivery, so as you do not yet qualify for money being released within 24 hours, then you will have to wait which could be up to 20 days.
Long winded way round, cancel sale and relist as collection. This is not always convenient for buyer who may not get refund quickly and therefore having to pay again., before refund comes through.
It would be a good idea when listing to select the two options of collection or postage, then it is up to buyer to choose when paying.