Payment Processor error

[AliveMedia]

Hello, I have a client that we designed a site for using VM 1.1.8 on Joomla! 1.5.26 (It was several years ago).  They are using internet secure as their payment processor and all of the sudden a few days ago they started receiving failure in processing the payment errors for internet secure [Failure in Processing the Payment (ps_isecure)].  Paypal is another option in the store, and it seems to work fine.  Anyway, looking for a VirtueMart/programming expert that can help with this issue.  Please email me at the left if interested.  There's more work that we can send your way if this works out well.  Thanks!