Cqrs.Command.handle_authorize

You're seeing just the callback handle_authorize, go back to Cqrs.Command module for more information.
Link to this callback

handle_authorize(command, keyword)

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Specs

handle_authorize(command(), keyword()) ::
  {:ok, command()} | {:ok, :halt} | any()

This callback is intended to authorize the execution of the command.

This callback is optional.

Invoked after before_dispatch/2 and before handle_dispatch/2.