Someone sent me several hundred U.S. dollars Paypal for in exchange for services. This was a verbal agreement, and there was no receipt. I have decided not to fulfill my end of the agreement, but want to keep the money sent via PayPal anyway. Can the other party chargeback the money sent to me via PayPal, i.e. take the money back?
According to PayPal, if he or she used a credit or debit card, then yes.
Whether or not you or the other person has a receipt, all transactions can be disputed up until 90 days. If the other person decides to create a dispute and escalate it, paypal will take matters into their own hands and create an investigation. Now, it is up to paypal to decide if you get to keep the funds or if it goes back to the other person.