Buyers cant cancel transactions, since you have shipping as the delivery option, you will have no delivery confirmation number to prove delivery, and the buyer could file item not received. Your best bet is to cancel the transaction, use at buyers request,and relist it as pick up only and let him purchase it that way. Delivery confirmation is not required for pick up only items..you will be given a code to use for the pick up...and you can request cash at pick up..tho the buyer can use PP if he wants.
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“Never pick a fight with an ugly person. They don’t have anything to lose.” ~Robin Williams