The /atg/campaign/servlet/ParameterStringCodec
component is used by the ATG Outreach servlet pipeline and ACO tag library to encode and decode parameter strings. It includes a secret
property, which generates a unique hash value to protect the integrity of e-mail URL parameters. This property must be set to a string value that will not be exposed beyond your production servers.
secret=<string_value>
Note: You must set this property to the same value on each ATG Outreach Staging/Production instance.