Resolved -
Please see a further update from Fiserv below:
Fiserv would like to advise clients and partners that the issue impacting Mastercard transaction processing has now been resolved. Mastercard transactions are now processing as expected.
Aug 26, 09:59 AEST
Identified -
Fiserv has confirmed they are currently investigating a service disruption to Mastercard Transaction Processing on their side.
Aug 26, 07:50 AEST
Investigating -
We are currently investigating a problem with merchants acquiring via Fiserv (First Data), receiving '91 - Host or Switch Unavailable' responses for some transactions.
Aug 26, 07:48 AEST