diff --git a/README.md b/README.md
index 2bee193..7744279 100644
--- a/README.md
+++ b/README.md
@@ -69,12 +69,13 @@ On multiple actions supported by this SDK you may need to pass some parameters,
 
 ```php
 $server = $forge->createServer([
-    "provider"=> "ocean2",
+    "provider"=> ServerProviders::DIGITAL_OCEAN,
     "credential_id"=> 1,
     "name"=> "test-via-api",
     "size"=> "01",
     "database"=> "test123",
-    "php_version"=> "php71",
+    "database_type" => InstallableServices::POSTGRES,
+    "php_version"=> InstallableServices::PHP_71,
     "region"=> "ams2"
 ]);
 ```
diff --git a/src/Resources/GitProviders.php b/src/Resources/GitProviders.php
new file mode 100644
index 0000000..923643e
--- /dev/null
+++ b/src/Resources/GitProviders.php
@@ -0,0 +1,11 @@
+<?php
+
+namespace Laravel\Forge\Resources;
+
+class GitProviders
+{
+    const BITBUCKET = 'bitbucket';
+    const CUSTOM = 'custom';
+    const GITHUB = 'github';
+    const GITLAB = 'gitlab';
+}
diff --git a/src/Resources/InstallableServices.php b/src/Resources/InstallableServices.php
new file mode 100644
index 0000000..a6f1d3a
--- /dev/null
+++ b/src/Resources/InstallableServices.php
@@ -0,0 +1,20 @@
+<?php
+
+namespace Laravel\Forge\Resources;
+
+class InstallableServices
+{
+    const PHP_56 = 'php56';
+    const PHP_70 = 'php70';
+    const PHP_71 = 'php71';
+    const PHP_72 = 'php72';
+    const PHP_73 = 'php73';
+    const PHP_74 = 'php74';
+
+    const MYSQL = 'mysql';
+    const MYSQL_8 = 'mysql8';
+
+    const MARIADB = 'mariadb';
+
+    const POSTGRES = 'postgres';
+}
diff --git a/src/Resources/LoadBalancingStrategies.php b/src/Resources/LoadBalancingStrategies.php
new file mode 100644
index 0000000..a2c4397
--- /dev/null
+++ b/src/Resources/LoadBalancingStrategies.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace Laravel\Forge\Resources;
+
+class LoadBalancingStrategies
+{
+    const ROUND_ROBIN = 'round_robin';
+    const LEAST_CONNECTIONS = 'least_conn';
+    const IP_HASH = 'ip_hash';
+}
diff --git a/src/Resources/ServerProviders.php b/src/Resources/ServerProviders.php
new file mode 100644
index 0000000..c4dbe9c
--- /dev/null
+++ b/src/Resources/ServerProviders.php
@@ -0,0 +1,13 @@
+<?php
+
+namespace Laravel\Forge\Resources;
+
+class ServerProviders
+{
+    const AWS = 'aws';
+    const CUSTOM = 'custom';
+    const DIGITAL_OCEAN = 'ocean2';
+    const HETZNER = 'hetzner';
+    const LINODE = 'linode';
+    const VULTR = 'vultr';
+}