WeChat.Storage.Client.fetch_access_token

You're seeing just the callback fetch_access_token, go back to WeChat.Storage.Client module for more information.

fetch_access_token(appid, args)

Specs

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

Fetch access_token of WeChat common application.