If we wish to have multiple Duo applications -- to support multiple policies -- can we add an additional bean like below to 'duo-authn-config.xml'? We have already consumed 'SpecialDuo' for a very special application.
You can have as many as you want but you have to build a strategy function to determine which one to use as the documentation outlines; there's a bean name reserved (name is not in my memory, it's in the documentation).
That will be evaluated and called to get the integration parameters. The default behavior just automatically applies a function that statically returns a single integration, but you can build your own to do it however you want.