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This article applies to: ML v7, ML8, MultiStore

Error calling CyberSource gateway - the type initializer for CyberSource.Clients.SoapClient threw an exception

When using the Cybersource gateway, customers receive this error after entering their payment info and clicking Place Order.

The web server does not have the Microsoft WSE 3.0 addon installed.

Install the MS WSE 3.0 addon on the server.  That is a free download from http://www.microsoft.com/downloads/details.aspx?familyid=018A09FD-3A74-43C5-8EC1-8D789091255D&displaylang=en