Just about anyone using PayPal's back-end payment notification has experienced this. The article says PayPal notifies you about a delay but I've seen cases wher

Just about anyone using PayPal's back-end payment notification has experienced this. The article says PayPal notifies you about a delay but I've seen cases where even that doesn't happen. If you're selling a service, the best thing to do is to provide a grace period. So to maintain goodwill you just let 'em in and if PayPal doesn't confirm payment within 48 hours you suspend the account until they pay. Obviously that doesn't work well for non-revocable transactions, but you have to weigh the potential for fraud against the lost sales.