diff --git a/config/dev.exs b/config/dev.exs
deleted file mode 100644
index d38828d..0000000
--- a/config/dev.exs
+++ /dev/null
@@ -1,3 +0,0 @@
-use Mix.Config
-
-config :smartsheet, client: Smartsheet.MockClient
diff --git a/config/prod.exs b/config/prod.exs
deleted file mode 100644
index d4752d9..0000000
--- a/config/prod.exs
+++ /dev/null
@@ -1,3 +0,0 @@
-use Mix.Config
-
-config :smartsheet, client: Smartsheet.Client
diff --git a/config/test.exs b/config/test.exs
index d38828d..a519467 100644
--- a/config/test.exs
+++ b/config/test.exs
@@ -1,3 +1,3 @@
 use Mix.Config
 
-config :smartsheet, client: Smartsheet.MockClient
+config :smartsheet, api_key: "Test123"
diff --git a/lib/smartsheet/mock_client/mock_client.ex b/lib/smartsheet/mock_client/mock_client.ex
deleted file mode 100644
index 9327cbb..0000000
--- a/lib/smartsheet/mock_client/mock_client.ex
+++ /dev/null
@@ -1,47 +0,0 @@
-defmodule Smartsheet.MockClient do
-  def get("/sheets/get_sheet_fail_id", _header, _options) do
-    Smartsheet.MockClient.ResponseFixtures.get_sheet_failure("get_sheet_fail_id")
-  end
-
-  def get("/sheets/" <> id, _headers, _options) do
-    Smartsheet.MockClient.ResponseFixtures.get_sheet_success(id)
-  end
-
-  def post("/sheets", _attributes, _headers) do
-    Smartsheet.MockClient.ResponseFixtures.create_sheet_success()
-  end
-
-  def post("/sheets/:id/rows", rows, _headers) do
-    Smartsheet.MockClient.ResponseFixtures.add_rows_success(rows)
-  end
-
-  def post("/sheets/" <> suffix, attributes, headers) do
-    case String.split(suffix, "/") do
-      ["add_rows_fail_id", "rows"] ->
-        Smartsheet.MockClient.ResponseFixtures.add_rows_failure()
-
-      [_id, "rows"] ->
-        Smartsheet.MockClient.post("/sheets/:id/rows", attributes, headers)
-
-      _ ->
-        nil
-    end
-  end
-
-  def put("/sheets/:id/rows", rows, _headers) do
-    Smartsheet.MockClient.ResponseFixtures.update_rows_success(rows)
-  end
-
-  def put("/sheets/" <> suffix, attributes, headers) do
-    case String.split(suffix, "/") do
-      ["update_rows_fail_id", "rows"] ->
-        Smartsheet.MockClient.ResponseFixtures.update_rows_failure()
-
-      [_id, "rows"] ->
-        Smartsheet.MockClient.put("/sheets/:id/rows", attributes, headers)
-
-      _ ->
-        nil
-    end
-  end
-end
diff --git a/lib/smartsheet/mock_client/request_fixtures.ex b/lib/smartsheet/mock_client/request_fixtures.ex
deleted file mode 100644
index 31741b1..0000000
--- a/lib/smartsheet/mock_client/request_fixtures.ex
+++ /dev/null
@@ -1,25 +0,0 @@
-defmodule Smartsheet.MockClient.RequestFixtures do
-  def create_sheet_success() do
-    columns = [
-      %{
-        primary: true,
-        title: "Column_1",
-        type: Smartsheet.Column.ColumnType.text_number()
-      }
-    ]
-
-    %{name: "Create Sheet Success", columns: columns}
-  end
-
-  def create_sheet_failure() do
-    columns = [
-      %{
-        primary: false,
-        title: "Column_1",
-        type: Smartsheet.Column.ColumnType.text_number()
-      }
-    ]
-
-    %{name: "Create Sheet Failure", columns: columns}
-  end
-end
diff --git a/lib/smartsheet/parse_response.ex b/lib/smartsheet/parse_response.ex
index c7140bf..85234b1 100644
--- a/lib/smartsheet/parse_response.ex
+++ b/lib/smartsheet/parse_response.ex
@@ -89,12 +89,12 @@ defmodule Smartsheet.ParseResponse do
     Enum.map(columns, fn column -> struct(Smartsheet.Column, column) end)
   end
 
-  def success_response(response = %HTTPoison.Response{}, data) do
+  defp success_response(response = %HTTPoison.Response{}, data) do
     formatted_response = Smartsheet.Response.format(response)
     {:ok, formatted_response, data}
   end
 
-  def error_response(response = %HTTPoison.Response{}) do
+  defp error_response(response = %HTTPoison.Response{}) do
     formatted_response = Smartsheet.Response.format(response)
     {:error, formatted_response}
   end
diff --git a/lib/smartsheet/mock_client/response_fixtures.ex b/lib/smartsheet/response_fixtures.ex
similarity index 100%
rename from lib/smartsheet/mock_client/response_fixtures.ex
rename to lib/smartsheet/response_fixtures.ex
diff --git a/mix.exs b/mix.exs
index 73d7e44..6feb93f 100644
--- a/mix.exs
+++ b/mix.exs
@@ -6,7 +6,7 @@ defmodule Smartsheet.MixProject do
       app: :smartsheet,
       description: "HTTP wrapper around the Smartsheet API",
       package: package(),
-      version: "2.0.0",
+      version: "2.1.0",
       elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()
diff --git a/test/smartsheet/http_client_test.exs b/test/smartsheet/http_client_test.exs
index 5d31793..c8924a4 100644
--- a/test/smartsheet/http_client_test.exs
+++ b/test/smartsheet/http_client_test.exs
@@ -81,7 +81,7 @@ defmodule Smartsheet.HttpClientTest do
     test "it appends Authorization Headers" do
       headers = {"Content-Type", "application/json"}
 
-      assert [{:Authorization, "Bearer "} | {"Content-Type", "application/json"}] ==
+      assert [{:Authorization, "Bearer Test123"} | {"Content-Type", "application/json"}] ==
                HttpClient.process_request_headers(headers)
     end
   end