WeChat.Storage.ComponentHub.fetch_component_access_token

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

fetch_component_access_token(appid, args)

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Specs

fetch_component_access_token(appid :: String.t(), args :: term()) ::
  {:ok,
   %WeChat.Token{
     access_token: term(),
     expires_in: term(),
     refresh_token: term(),
     timestamp: term()
   }}

Get access_token of WeChat component application.