diff --git a/lib/fitgem/client.rb b/lib/fitgem/client.rb
index 90cf028..3b0e9a3 100644
--- a/lib/fitgem/client.rb
+++ b/lib/fitgem/client.rb
@@ -119,6 +119,37 @@ def initialize(opts)
       @api_locale = opts[:locale] || Fitgem::ApiLocale.US
     end
 
+    # Get authorize_url
+    #
+    # @param [String] Space separated access scope (i.e. 'activity nutrition')
+    # @param [String] Redirect URI
+    # @return [String] Authorize URL
+    def authorize_url(scope, redirect_uri)
+      consumer.auth_code.authorize_url(redirect_uri: redirect_uri, scope: scope)
+    end
+
+    # Get token
+    #
+    # @param [String] Authorization code
+    # @param [String] Redirect URI
+    # @return [OAuth2::AccessToken] Accesstoken and refresh token
+    def get_token(authorization_code, redirect_uri)
+      consumer.auth_code.get_token(authorization_code, headers: auth_header, redirect_uri: redirect_uri)
+    end
+
+    # Refresh access token
+    #
+    # @param [String] Refresh token
+    # @return [OAuth2::AccessToken] Accesstoken and refresh token
+    def refresh_access_token!(refresh_token)
+      new_access_token = OAuth2::AccessToken.new(consumer, @token, refresh_token: refresh_token)
+      # refresh! method return new object not itself and not change itself
+      new_token = new_access_token.refresh!(headers: auth_header)
+      @token = new_token.token
+      @access_token = nil
+      new_token
+    end
+
     private
 
       def consumer
@@ -182,5 +213,9 @@ def default_headers
           'Accept-Locale' => @api_locale
         }
       end
+
+      def auth_header
+        {Authorization: "Basic #{ Base64.encode64("#{ @consumer_key }:#{ @consumer_secret }") }" }
+      end
   end
 end
diff --git a/spec/fitgem_client_spec.rb b/spec/fitgem_client_spec.rb
index eb1db5d..8c45930 100644
--- a/spec/fitgem_client_spec.rb
+++ b/spec/fitgem_client_spec.rb
@@ -4,12 +4,24 @@
   let(:access_token) {
     double 'Access Token', :get => response, :request => response
   }
+  let(:consumer_key) { '12345' }
+  let(:consumer_secret) { '67890' }
   let(:client)       { Fitgem::Client.new({
-    :consumer_key => '12345',
-    :consumer_secret => '67890'
+    :consumer_key => consumer_key,
+    :consumer_secret => consumer_secret
   }) }
   let(:response)     { double :body => {:foo => :bar}.to_json, :status => 200 }
   let(:consumer)     { double 'Consumer' }
+  let(:redirect_uri) { 'http://example.com/redirect_url' }
+  let(:auth_url) { 'http://example.com/auth_url' }
+  let(:auth_code) { 'code' }
+  let(:scope) { 'activity nutrition heartrate location nutrition profile settings sleep social weight' }
+  let(:auth_header) {
+    {
+        Authorization: "Basic #{Base64.encode64("#{consumer_key}:#{consumer_secret}")}"
+    }
+  }
+  let(:auth_token) { 'token' }
 
   before :each do
     allow(OAuth2::Client).to receive(:new).with('12345', '67890', {
@@ -18,6 +30,19 @@
       :authorize_url => "https://www.fitbit.com/oauth2/authorize"
     }).and_return(consumer)
     allow(OAuth2::AccessToken).to receive(:new).and_return(access_token)
+
+    allow(consumer).to receive_message_chain('auth_code.authorize_url').
+        with({scope: scope, redirect_uri: redirect_uri}).and_return(auth_url)
+    allow(consumer).to receive_message_chain('auth_code.get_token').
+        with(auth_code, {headers: auth_header, redirect_uri: redirect_uri}).and_return(auth_token)
+  end
+
+  it 'get authorize url' do
+    expect(client.authorize_url(scope, redirect_uri)).to eq auth_url
+  end
+
+  it 'get token'do
+    expect(client.get_token(auth_code, redirect_uri)).to eq auth_token
   end
 
   it 'returns JSON from the request' do