If the PayPal email address you used is different from your Receipt Hog email address, you will receive the payment confirmation within the inbox assigned to your PayPal email address.
If you request a payment using an unregistered PayPal account, you will need to set up an account with PayPal under that address to claim that payment by clicking here.
Keep in mind, if a payment is not claimed within 30 days it will be refunded and your coins will be returned to your account.