Adding _calc to BF Schema

mbeargie:
Just checking, but how flexible is adding _calc to most places in the BF schema? I’m trying to put authorize.net keys into the app model in order to setup dev (sandbox) staging (automatically changes to a trivial $1 charge with the production keys on the FM side), and Production (production keys, actual charges).

Just wanted to see how proper this is before going down that path. If the authorize type BF object does not support these dynamic keys, how should I handle dynamic key values?

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Delfs:
totally fine in page schema, where it can not be used is in places that do not have context, eg in actions.