def deps do
  [
    {:aliyun_oss, "~> 2.0"}
  ]
end

defmodule MyApp.Oss do
  alias Aliyun.Oss.Config
  alias Aliyun.Oss.Bucket

  def list_buckets(query_params \\ %{}) do
    Bucket.list_buckets(config(), query_params)
  end

  # encapsulate more API that you required ...

  def config() do
    :my_app
    |> Application.fetch_env!(MyApp.Oss)
    |> Config.new!()
  end
end

# In the config/runtime.exs
config :my_app, MyApp.Oss,
  endpoint: "...",
  access_key_id: "...",
  access_key_secret: "..."