Templates applied to a specific interface format, or re-format, all messages processed by this interface. Interface level variables will override the same variables specified on a Global level but will be overridden by variables specified at a Connector, Carrier or Recipient level.
For example, if the Interface Template formats the message to standardize the Sender's Name to a static value, but a Connector, Carrier or Recipient template specifies a different value, messages passed through those Carriers or to those Recipients will use the Sender's Name variable from their own templates and ALL other variables from higher level templates.