WeChat.MiniProgram.Code.create_code

You're seeing just the function create_code, go back to WeChat.MiniProgram.Code module for more information.
Link to this function

create_code(client, path, width \\ 430, options \\ %{})

Specs

create_code(WeChat.client(), path(), width(), code_options()) ::
  WeChat.response()

生成的小程序码 - 官方文档

获取小程序码,适用于需要的码数量较少的业务场景。通过该接口生成的小程序码,永久有效,有数量限制, 详见获取二维码