Elixir module refactoring pattern

1 original_webhook_handler.ex

# Original

defmodule Service.WebhookHandler do
  def register_webhook(name) do
    case Registry.register(webhook_id(name), __MODULE__) do
      {:ok, _pid} -> :ok
      error -> error
    end
  end
  
  def webhook_id(name), do: "wb-#{name}"
end

2 new_common_webhook_handler.ex

defmodule WebhookHandler do

  @callback webhook_id(name :: String.t()) :: String.t()
  
  @spec register_webhook(module(), String.t()) :: :ok | {:error, any()}
  def register_webhook(module, name) do
    case Registry.register(module.webhook_id(name), module) do
       {:ok, _pid} -> :ok
       error -> error
    end
  end
end

3 new_service_webhook_handler.ex

# New

defmodule Service.WebhookHandler do
  @behaviour WebhookHandler
  
  def register_webhook(name) do
    WebhookHandler.register_webhook(__MODULE__, name)
  end
  
  @impl true
  def webhook_id(name), do: "wb-#{name}"
end

4 advanced_webhook_handler.ex

# Advanced with default implementation

defmodule WebhookHandler do
  @callback webhook_id(name :: String.t()) :: String.t()
  
  defmacro __using__(_opts) do
    quote do
      @behaviour WebhookHandler
      
      def register_webhook(name), do: WebhookHandler.register_webhook(__MODULE__, name)
    end
  end
  
  @spec register_webhook(module(), String.t()) :: :ok | {:error, any()}
  def register_webhook(module, name) do
    case Registry.register(module.webhook_id(name), module) do
       {:ok, _pid} -> :ok
      error -> error
    end
  end
end

defmodule Service.WebhookHandler do
  use WebhookHandler
  
  @impl true
  def webhook_id(name), do: "wb-#{name}"
end