If you submit a ticket with your PayPal transaction ID, we can look it up. Sometimes, it's a payment through an eCheque, so PayPal takes a few days to pull the money (from your bank). Recently, we have also had a few instances of PayPal being a bit slow in actually sending the transaction to us; that usually clears up in an hour or so. Finally, it could be that PayPal has flagged the payment for review so we need to wait until that is resolved (usually 24 hours).