How to engage the user while waiting for Instant Payment Notification from PayPal

I am creating a donation platform which will be using PayPal as a payment gateway. When the payment is made, the donor will be redirected back to the platform and I want to show confirmation there as soon as the platform is notified by Instant Payment Notification from PayPal.

The problem is that the IPN is sent only 10 seconds after the payment is made. What would be the best way to make the donor busy while waiting for the confirmation?

Donors suppose to donate multiple times, so it should be not too boring to them, neither too repetitive.

P.S. I know that it would be possible to use Payment Data Transfer (PDT) instead of IPN, but I want to avoid it, because of more demanding configuration on the donation receiver's side.