diff --git a/README.md b/README.md
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+++ b/README.md
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+## SSO Riau
+SSO Riau
+
+Construct:
+----
+
+```$php
+$this->clientId = '';   // 3rd Party client Id
+$this->clientSecret = '';   // 3rd Party client secret
+$this->redirectUri = '';  // 3rd Party url redirect or url to handle callback
+$this->targetUri = 'https://sso.riau.go.id/';    // SSO Riau portal
+
+```
+Check SSO session :
+----
+
+```$php
+use SsoRiau\SsoClientLibrary;
+$objSso = new SsoClientLibrary();
+$objSso->ssoRequest();
+
+```
+Consume SSO session :
+----
+
+```$php
+$objSso = new SsoClientLibrary();
+$data_access_token = $objSso->ssoCallback();
+if (!empty($data_access_token)) {
+    $data_access_token = json_decode($data_access_token);
+    $access_token = $data_access_token->access_token; // store access_token within the session if needed?
+}
+
+if ($access_token != '') {
+    //fetch ssoUserInfo
+    $ssoUserInfo = $objSso->ssoUserInfo($access_token);
+    $ssoUserInfo = json_decode($ssoUserInfo);
+    $email = $ssoUserInfo->email;
+}
+
+```
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diff --git a/composer.json b/composer.json
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+++ b/composer.json
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+{
+    "name": "ssoriau/ssoclientlibrary",
+    "description": "SsoClientLibrary",
+    "type": "library",
+    "license": "MIT",
+    "authors": [
+        {
+            "name": "ssoriau",
+            "email": "sso@riau.go.id"
+        }
+    ],
+    "minimum-stability": "dev",
+    "prefer-stable": true,
+    "require": {
+        "php": ">=7.1"
+    },
+    "autoload": {
+        "psr-4": {
+            "SsoRiau\\": "src/"
+        }
+    }
+}
diff --git a/src/SsoClientLibrary.php b/src/SsoClientLibrary.php
new file mode 100644
index 0000000..315e9d1
--- /dev/null
+++ b/src/SsoClientLibrary.php
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+<?php
+
+namespace SsoRiau;
+
+/*
+ * Nama   : File SSO Riau client library
+ * Tujuan : File ini dibuat dalam bentuk class objek sehingga dapat di integrasikan
+ *          dengan aplikasi pihak ketiga yang ingin terhubung menggunakan aplikasi SSO
+ * Deskripsi Variable :
+ *  $clientId
+ *  - merupakan identitas unik ID yang diperoleh saat mendaftarkan
+ *    aplikasi pihak ketiga pada aplikasi SSO
+ *  $clientSecret
+ *  - merupakan identitas unik Secret (rahasia) yang digunakan saat akses 
+ *    kepada aplikasi SSO sehingga diizinkan
+ *  $redirectUri
+ *  - merupakan alamat url yang akan mengelola hasil informasi login SSO
+ *  $targetUri
+ *  - adalah alamat website aplikasi SSO
+ * 
+ */
+
+class SsoClientLibrary {
+
+    protected $clientId;
+    protected $clientSecret;
+    protected $redirectUri;
+    protected $targetUri;
+
+    public function __construct() {
+        $this->clientId = '';   // 3rd Party client Id
+        $this->clientSecret = '';   // 3rd Party client secret
+        $this->redirectUri = '';  // 3rd Party url redirect or url to handle callback
+        $this->targetUri = 'https://sso.riau.go.id/';    // SSO Riau portal
+    }
+
+    public function ssoRequest() {
+        $state = base64_encode(random_bytes(40));
+        $query = http_build_query([
+            'client_id' => $this->clientId,
+            'redirect_uri' => $this->redirectUri,
+            'response_type' => 'code',
+            'scope' => '',
+            'state' => $state,
+        ]);
+
+        $_url = $this->targetUri ."oauth/authorize?" . $query;
+        echo '<pre>';print_r($_url);
+        header("Location: " . $_url);
+        die();
+    }
+
+    public function ssoCallback() {
+        if (isset($_GET['code']) && !empty(($_GET['code']))) {
+            $_access_token = '';
+            $_errors = '';
+
+            $_posts = [
+                'grant_type' => 'authorization_code',
+                'client_id' => $this->clientId,
+                'client_secret' => $this->clientSecret,
+                'redirect_uri' => $this->redirectUri,
+                'code' => $_GET['code'],
+            ];
+            $arr_token = $this->__runCurl('POST', $this->targetUri."oauth/token", $_posts);
+            return $arr_token;
+        }
+        die('Something went wrong, please trace back your action!');
+    }
+
+    public function ssoUserInfo($access_token) {
+        if ($access_token != '') {
+            $header = [
+                'Content-Type: application/json',
+                'Authorization: Bearer '.$access_token,
+            ];
+            $user_info = $this->__runCurl('GET', $this->targetUri."api/userInfo", [], $header);
+            return $user_info;
+        }
+        die('Something went wrong, please trace back your action!');
+    }
+
+    public function ssoAsnInfo($access_token, $nip) {
+        if ($access_token != '' && $nip != '') {
+            $header = [
+                'Content-Type: application/json',
+                'Authorization: Bearer '.$access_token,
+            ];
+
+            $query = http_build_query([
+                'nip' => $nip
+            ]);
+            $asn_info = $this->__runCurl('POST', $this->targetUri."api/userData?".$query, [], $header);
+            return $asn_info;
+        }
+        die('Something went wrong, please trace back your action!');
+    }
+
+    private function __runCurl($method = 'GET', $url, $data = [], $header = []) {
+        $error = '';
+        $ch = curl_init($url);
+        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
+        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
+        if ($method == 'POST') {
+            curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
+        }
+        if (!empty($header)) {
+            curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
+        }
+        //curl_setopt($ch, CURLOPT_TIMEOUT, 5); //timeout in seconds
+        //curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
+        //curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
+
+        $response = curl_exec($ch);
+        if (curl_error($ch)) {
+            $error = curl_error($ch);
+        }
+        curl_close($ch);
+
+        if ($error == '' && !empty($response)) {
+            return $response;
+        } else {
+            return $error;
+        }
+        die('Something went wrong, please trace back your action!');
+    }
+
+}
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