Cancel Pending Paypal Transaction. Payment can only be canceled if it's marked as Pending or Unclaimed on its Transaction details page. Learn how to cancel a pending payment sent through PayPal.
While cancelling a pending PayPal transaction is easy, getting a refund for a completed payment can be a long and frustrating process. To obtain the recipient's contact information, click the Summary tab on the main menu, if it's not selected already, and then select the transaction in which you sent money to the recipient. To cancel PayPal payment, or cancel PayPal transfer, the transaction must be in "Pending" or "Unclaimed" status.
If you paid with an eCheck or an Instant Transfer, the payment is back in your Paypal account.
Right now i need that money back to my paypal account No its not possible to cancel that transaction, you most definitely have to wait until complete and transfer again.
Note: You can refund payments that are Completed, Pending, Cleared, or Uncleared. You cannot cancel transactions that have already been confirmed on etherscan. Learn everything about PayPal pending transactions.