Hey there,
If you are unsure about anything then it is always best to change your password.
It does happen that payments don't complete to the seller due to the email address being incomplete. This could be down to the seller updating the address on either eBay or PayPal and forgetting to update the other or not confirming the email address or having a simple spelling mistake in the email. Any of this can cause the payment to remain unclaimed.
The seller would need your email address in order to send you a money request form the correct email address.
If the payment was an unusual amount for you to be making, then yes, PayPal can make calls to verify this. If you get a call from PayPal, the only things that you may be asked to confirm are your email address and the last 4 digits of a card or bank account.
We would never ask for your password or full card/bank details.
I hope this helps.
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