A correspondent in the field, Nic Jefferis has sent in this story about how a “database glitch” has affected customers of the Egg on-line bank who have been trying to pay their bills using their NatWest debit cards.

The BBC describes the problem very succintly:

“The problem is that the Egg website does not recognise Natwest Visa Debit cards as being legitimate cards.”

The root cause seems to stem from the fact that key base data used by Egg’s on-line bank, the valid set of Bank Identification Numbers, appears to to not include NatWest Visa debit cards as they are only being rolled out at the moment to replace the existing Maestro Debit card facility currently in use at NatWest.

And at this point the second common component of IQTrainwrecks raises its head – who is responsible for the data.

Egg get their data from Experian. As soon as the problem arose, Egg contacted Experian to get a solution.  Natwest state that they were “aware of this problem and raised it with Egg at the outset” and were waiting for Egg to sort out the problem in their systems.

Somewhere in the process for maintaining BIN master data something has gone awry which has affected the ability of NatWest customers to pay bills using their new Visa debit cards. As the problem appears to be in the underlying base data, it is possible that there are impacts wider afield than just Egg’s payment systems.

As a source quoted in the BBC report says, this should be a straightforward process and an error like this would be highly unusual. But as we know here at IQTrainwrecks, it is often the simple errors that can have the biggest knock on impacts in downstream systems and processes resulting in loss, damage, injury, or frustration.