| Helpにありました。
相手が受け取り完了していない場合のみキャンセルできます。 受け取りしている場合はだめですね。
取引確認画面で(Recent Activity | All Activity)、status が Completed だと完了しています。
Can I cancel a payment that I've already sent?
You may only cancel a payment if it is unclaimed, and the recipient has not yet signed up for a PayPal account and collected the money. (If your payment is completed and you'd like to request a refund, please contact the recipient of the payment directly.)
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