Shun.Verifier.perform

You're seeing just the function perform, go back to Shun.Verifier module for more information.
Link to this function

perform(provider, value, options \\ [])

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Specs

perform(provider(), value(), [option()]) :: result()

Performs verification of the value using the Provider module provided.

In case of Strings being used, it will first be parsed as an URI and validated as URI.