diff --git a/.gitignore b/.gitignore
index 71bb129..1424e90 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,3 @@
 config.ini
 tags
-
+vendor/
diff --git a/composer.json b/composer.json
index 00a9faa..7061f8d 100644
--- a/composer.json
+++ b/composer.json
@@ -1,4 +1,17 @@
 {
 	"name": "brunofontes/memsource-api",
-	"version": "1.0.0"
+	"version": "1.0.0",
+	"description": "A personal memsource api to better understand how it works",
+    "autoload": {
+        "psr-4": {
+            "BrunoFontes\\": "src/",
+            "BrunoFontes\\Memsource\\": "src/"
+        }
+	},
+   "repositories": [
+        {
+            "type": "vcs",
+            "url": "https://github.com/brunofontes/Memsource-API"
+		}
+   ]
 }
diff --git a/src/Memsource.php b/src/Memsource.php
new file mode 100644
index 0000000..b7ac081
--- /dev/null
+++ b/src/Memsource.php
@@ -0,0 +1,79 @@
+<?php
+/**
+ * A very compact and simple Memsource API library
+ * 
+ * @author Bruno Fontes <developer@brunofontes.net>
+ * @link   https://github.com/brunofontes
+ */
+namespace BrunoFontes;
+
+class Memsource
+{
+    private $_oauth;
+    protected $base_url;
+    protected $token;
+
+    public function __construct(string $memsourceBaseUrl = 'https://cloud.memsource.com/web')
+    {
+        $this->base_url = $memsourceBaseUrl;
+    }
+
+    public function oauth()
+    {
+        return $this->_oauth ?? $this->_oauth = new \BrunoFontes\Memsource\oauth();
+    }
+
+    public function get(string $url)
+    {
+        $response = $this->curl($url);
+        return json_decode($response, true);
+    }
+
+    protected function apiDownloadFile(string $url, array $postFields, string $filename)
+    {
+        $file = fopen($filename, 'w+');
+        $extraSetopt = [
+            CURLOPT_FILE => $file,
+            CURLOPT_FOLLOWLOCATION => true,
+        ];
+        return $this->jsonPost($url, $postFields, $extraSetopt);
+    }
+
+    protected function jsonPost(string $url, array $postFields, array $extraSetopt = [], array $extraHeader = [])
+    {
+        $extraHeader = (['Content-type: application/json'] + $extraHeader);
+        $postFields = json_encode($postFields);
+        $response = $this->post($url, $postFields, [], $extraHeader);
+        return json_decode($response, true);
+    }
+
+    protected function post(string $url, string $postFields, array $extraSetopt = [], array $extraHeader = [])
+    {
+        $extraSetopt = (
+            $extraSetopt + 
+            [
+                CURLOPT_POST => true,
+                CURLOPT_POSTFIELDS => $postFields
+            ]
+        );
+        $response = $this->curl($url, $extraSetopt, $extraHeader);
+        return json_decode($response, true);
+    }
+
+    protected function curl(string $url, array $curl_extra_setopt=[], array $extraHeader=[])
+    {
+        $header = $this->token ? ["Authorization: Bearer {$this->token}"] : [];
+        $curl_setopt = [
+            CURLOPT_URL => $this->base_url . $url,
+            CURLOPT_HTTPHEADER => ($header + $extraHeader),
+            CURLOPT_SSL_VERIFYPEER => false,
+            CURLOPT_TIMEOUT => 500,
+            CURLOPT_FOLLOWLOCATION => true,
+        ];
+        $curl = curl_init();
+        curl_setopt_array($curl, ($curl_setopt + $curl_extra_setopt));
+        $response = curl_exec($curl);
+        curl_close($curl);
+        return $response;
+    }
+}
\ No newline at end of file
diff --git a/src/auth.php b/src/auth.php
new file mode 100644
index 0000000..cf7ea46
--- /dev/null
+++ b/src/auth.php
@@ -0,0 +1,34 @@
+<?php
+/**
+ * A very compact and simple Memsource API library
+ * 
+ * @author Bruno Fontes <developer@brunofontes.net>
+ * @link   https://github.com/brunofontes
+ */
+namespace BrunoFontes\Memsource;
+
+class Auth
+{
+    protected $base_url;
+    private $_client_id;
+    private $_client_secret;
+    
+    function __construct(string $base_url)
+    {
+        $this->base_url = $base_url;
+    }
+
+    /**
+     * Directly login and get a token valid for 24h
+     *
+     * @param string $username Memsource username
+     * @param string $password Memsource password
+     * 
+     * @return string Authorization code valid for 24h only
+     */
+    function login(string $username, string $password)
+    {
+        $authorize_url = $this->base_url . '/oauth/authorize';
+        return $authorize_url . '?response_type=code&client_id=' . $client_id . '&redirect_uri=' . $callback_uri . '&scope=openid';
+    }
+}
diff --git a/src/oauth.php b/src/oauth.php
new file mode 100644
index 0000000..9be48a6
--- /dev/null
+++ b/src/oauth.php
@@ -0,0 +1,41 @@
+<?php
+/**
+ * A very compact and simple Memsource API library
+ * 
+ * @author Bruno Fontes <developer@brunofontes.net>
+ * @link   https://github.com/brunofontes
+ */
+namespace BrunoFontes\Memsource;
+
+class Oauth extends \BrunoFontes\Memsource
+{
+    private $_url = '/oauth';
+    
+    /**
+     * Get the URL to generate the Authorization Code from Memsource
+     *
+     * @param string $client_id     Memsource client ID
+     * @param string $client_secret Memsource client secret
+     * @param string $callback_uri  URL that Memsource will redirect to
+     * 
+     * @return string the authorization code
+     */
+    public function getAuthorizationCodeUrl(string $client_id, string $callback_uri)
+    {
+        $authorize_url = $this->_url . '/authorize';
+        return $authorize_url . '?response_type=code&client_id=' . $client_id . '&redirect_uri=' . $callback_uri . '&scope=openid';
+    }
+
+    public function getAccessToken(string $authorization_code, string $client_id, string $client_secret, string $callback_uri)
+    {
+        $token_url = $this->_url . '/token';
+        $authorization = base64_encode("$client_id:$client_secret");
+        $header = ["Authorization: Basic {$authorization}", 'Content-Type: application/x-www-form-urlencoded'];
+        $content = "grant_type=authorization_code&code=$authorization_code&redirect_uri=$callback_uri";
+        $response = $this->post($token_url, $content, [], $header);
+        if ($respose['error']) {
+            throw new Exception("Error getting access token", 1);
+        }
+        return $response['access_token'];
+    }
+}