[1] A security issue in Australia Post’s SecurePay environment triggered the almost two months of service issues with NAB’s secure online payments gateway Transact.
[2] Transact is a customised version of Australia Post’s SecurePay and is widely used by retailers to accept secure online payments.
[3] NAB has been having consistent log-in issues, timeouts, transaction errors and problems with batch processing since April 27 on Transact.
[Source] Australian Information Technology News – SecurePay security issue triggered NAB Transact outages