WeChat.Account.download_qrcode

You're seeing just the function download_qrcode, go back to WeChat.Account module for more information.
Link to this function

download_qrcode(client, scene_id, action_name \\ "QR_LIMIT_SCENE", expire_seconds \\ 1800, dir_name \\ ".")

Specs

download_qrcode(
  WeChat.client(),
  scene_id :: String.t(),
  qrcode_action_name(),
  expire_seconds :: integer(),
  dir_name :: Path.t()
) :: WeChat.response() | {Collectable.t(), exit_status :: non_neg_integer()}

生成并下载二维码 - 官方文档