WeChat.Storage.ComponentHub.fetch_secret_key

You're seeing just the callback fetch_secret_key, go back to WeChat.Storage.ComponentHub module for more information.
Link to this callback

fetch_secret_key(appid, args)

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Specs

fetch_secret_key(appid :: String.t(), args :: term()) :: {:ok, String.t()} | nil

Get secret_key of WeChat component application.