WeChat.Storage.ComponentClient.fetch_access_token

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

fetch_access_token(appid, authorizer_appid, args)

Specs

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

Fetch authorizer's access_token in WeChat component application.