Hi, I didn't know exactly where to post this, but it's just a basic PayPal question. When someone sends me money on PayPal to pay for a service (i.e. not purchasing a product), is it possible for them to file claims / issue chargebacks against me afterwards and make up stories to PayPal that they did not receive the service they paid for? If yes, how would I be able to prove my innocence that I provided the service that was paid for? (since there is no product I can't provide tracking number etc).