References
There are a lot of cases where the users have to input their anwser selecting from a list of values which may or may not come from an independent external source. In any case, these options are highly configurable and we call them references
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A very good example of a reference is the license of a plan. The license options can either be configured as an internal (static) or an external (API) source.
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The way we configure a new reference is described in detail in the reference types administration section of the docs.