ahead block buyer code codes customer days delayed delivered down email emails extra feature fianlly finally free giving handle hasnt ipn loose manually money notifies paypal problem processed sale send service situation

How do i handle the situation when paypal IPN is down and i can tell that a sale was made but your service hasnt delivered the CODE to the customer? if I go ahead and do it manually in the emails myself then they will get another
CODE when paypal IPN fianlly notifies you.
This could be a big problem as i will loose money for giving the customer extra CODES for free.
How do i handle this?

We have a new feature coming up where you can "block" a buyer's email and the sale for that buyer will not be processed by us. So in case where IPN is delayed and you manually send the code to the buyer, you can block that buyer for a couple days so when PayPal finally send the
IPN, buyer won't get the code again.