diff --git a/config/services.yaml b/config/services.yaml
index 237e22c..6f66cca 100644
--- a/config/services.yaml
+++ b/config/services.yaml
@@ -1,5 +1,5 @@
 services:
     Magdev\RedmineBundle\Client\RedmineClient:
-        arguments: ['@redmine_api.cache', '%env(REDMINE_URL)%', '%env(REDMINE_APIKEY)%', '%magdev_redmine.ttl%']
+        arguments: ['@redmine_api.cache', '%magdev_redmine.url%', '%magdev_redmine.apiKey%', '%magdev_redmine.cache.ttl%']
 
     redmine.api: '@Magdev\RedmineBundle\Client\RedmineClient'
diff --git a/src/DependencyInjection/Configuration.php b/src/DependencyInjection/Configuration.php
index 000eed5..8e1497e 100644
--- a/src/DependencyInjection/Configuration.php
+++ b/src/DependencyInjection/Configuration.php
@@ -15,11 +15,28 @@ final class Configuration implements ConfigurationInterface
         $treeBuilder = new TreeBuilder('magdev_redmine');
         $rootNode = $treeBuilder->getRootNode();
         $rootNode->children()
-            ->scalarNode('ttl')
-                ->isRequired()
-                ->info('TTL for cached api calls')
-            ->end()
-        ->end();
+                    ->scalarNode('url')
+                        ->info('URL of the Redmine instance')
+                        ->example('http://your-redmine.com')
+                        ->cannotBeEmpty()
+                        ->isRequired()
+                    ->end()
+                    ->scalarNode('apiKey')
+                        ->info('API-Key to access Redmine')
+                        ->example('abcdefghijklmnopqrstuvwxyz')
+                        ->cannotBeEmpty()
+                        ->isRequired()
+                    ->end()
+                    ->arrayNode('cache')
+                        ->scalarNode('ttl')
+                            ->info('TTL for cached API calls')
+                            ->example([1800, 'P30M'])
+                            ->defaultValue(1800)
+                            ->cannotBeEmpty()
+                            ->isRequired()
+                        ->end()
+                    ->end()
+                ->end();
 
         return $treeBuilder;
     }
diff --git a/src/DependencyInjection/MagdevRedmineExtension.php b/src/DependencyInjection/MagdevRedmineExtension.php
index c90cbcd..64d2921 100644
--- a/src/DependencyInjection/MagdevRedmineExtension.php
+++ b/src/DependencyInjection/MagdevRedmineExtension.php
@@ -17,7 +17,9 @@ final class MagdevRedmineExtension extends Extension
     {
         $config = $this->processConfiguration(new Configuration(), $configs);
 
-        $container->setParameter('magdev_redmine.ttl', $config['ttl']);
+        $container->setParameter('magdev_redmine.cache.ttl', $config['cache']['ttl']);
+        $container->setParameter('magdev_redmine.url', $config['url']);
+        $container->setParameter('magdev_redmine.apiKey', $config['apiKey']);
 
         $loader = new YamlFileLoader($container, new FileLocator(dirname(__DIR__).'/../config'));
         $loader->load('services.yaml');