My wife sold some items on eBay and accidentally use an email address for PayPal for an account that no longer existed.
The buyers paid via PayPal, and eBay showed the transaction as paid, but clicking through to PayPal from eBay for that transaction gave an “invalid link” message.
Here’s where PayPal was really smart. My wife quickly opened a new PayPal account using that email address. A few minutes later, the eBay transactions all appeared in the new PayPal account.
So, PayPal must have held the originally erroneous transactions in a queue, until it figured out what to do with them. Then quickly matched them to the new account after it was created.
I’m a database programmer. This was a nice piece of coding on PayPal’s part.