Log in to your PayPal account
Go to Activity
Find the pending payment
Click the payment
Check whether a Cancel option is available
Click Cancel if shown
Confirm the cancellation
If no Cancel option appears, wait for the payment to complete or expire
If the payment was sent to an email address, check whether the recipient has accepted it
If the payment is pending as an eCheck, wait for it to clear or fail
Contact PayPal Support if you need help canceling it