Have you found out anything about this?

There was an in-between service provider that offered ZenCart modules for accepting payment and then pushes the payment to MPS. I also believe they shaved some pennies off each transaction for the service.

What I cannot remember is who the stupid company was, and searching Zen Cart and Mercury always comes back with the mercury mailserver issues. I am again looking for this, so far, without any luck.

Have you figured anything out around this? Have you Developed your own Software Kit by any chance?

-Tim