   defp prepare_authorization(config, signed_header_list, date_time, signature) do
     date = amz_date(date_time)
 
-    credential =
-      "#{config[:access_key]}/#{date}/#{config[:region]}/#{@service_name}/aws4_request"
-
-    "#{@encoding} Credential=#{credential}, SignedHeaders=#{signed_header_list}, Signature=#{
-      signature
-    }"
+    credential = "#{config[:access_key]}/#{date}/#{config[:region]}/#{@service_name}/aws4_request"
+
+    "#{@encoding} Credential=#{credential}, SignedHeaders=#{signed_header_list}, Signature=#{signature}"
   end
 
   defp prepare_header_security_token(headers, %{security_token: token}) do
     Map.put(headers, "X-Amz-Security-Token", token)
   end
-  
+
   defp prepare_header_security_token(headers, _provider_options), do: headers
 
   defp generate_signature(string_to_sign, date_time, region, secret) do

  end

  defp encrypt_value(secret, unencrypted_data),
    do: :crypto.hmac(:sha256, secret, unencrypted_data)

  defp amz_date(dt) do
    date_string =


  Ensure sure you have the dependency added in your mix.exs file.

      def deps do
        [
          {:swoosh, "~> 1.0"},
          {:gen_smtp, "~> 1.0"}
        ]
      end

  See Also:
