diff --git a/CHANGELOG.md b/CHANGELOG.md
index 352d146..9ede4db 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 ### Changelog
 
+### 0.3.0 - 11 September 2020 
+- Allow use of oauth token
+
+
 ### 0.2.3 - 27 March 2020 
 - Allow option to set `tld` property - top level domain  `com` (default), `eu`, `in`, `com.au` for API host
 
diff --git a/README.md b/README.md
index b371d8c..a30bb5c 100644
--- a/README.md
+++ b/README.md
@@ -15,6 +15,27 @@ use SudiptoChoudhury\Zoho\Subscriptions\Api;
 
 ...
 
+$subscriptions = new Api([
+                'oauthtoken' => '<<Zoho Subscriptions OAuth Token>>', // https://www.zoho.com/subscriptions/api/v1/#oauth
+                'zohoOrgId' => '<<Zoho Organization ID>>',
+            ]);
+
+
+$resultJson = $subscriptions->addCustomer($data); // create a customer
+
+$resultJson = $subscriptions->addSubscription($data); // create a subscription
+ 
+ 
+```
+
+> Auth Token (Will be deprecated soon), but you can still use it.
+
+```php
+
+use SudiptoChoudhury\Zoho\Subscriptions\Api;
+
+...
+
 $subscriptions = new Api([
                 'authtoken' => '<<Zoho Subscriptions Auth Token>>', // https://accounts.zoho.com/apiauthtoken/nb/create
                 'zohoOrgId' => '<<Zoho Organization ID>>',
@@ -52,10 +73,39 @@ composer require sudiptochoudhury/php-zoho-subscriptions
 ```
 
 
-## Setting up
+## Setting up Authentication 
+
+> **Get Organization ID** Before you start, read https://www.zoho.com/subscriptions/api/v1/#organization-id to know your Organization ID.  
+
+
+### Setup OAuth and use oauth token
+
+Follow instructions from https://www.zoho.com/subscriptions/api/v1/#oauth and get the `oathtoken`. 
+
+Pass the oauth token via the constructor.
+
+```php
+
+use SudiptoChoudhury\Zoho\Subscriptions\Api;
+
+
+new Api([
+    'oauthtoken' => '<<Zoho Subscriptions OAuth Token>>', // https://www.zoho.com/subscriptions/api/v1/#oauth
+    'zohoOrgId' => '<<Zoho Organization ID>>',
+]);
+```
+ 
+
+### Or Use AuthToken 
+> will be deprecated soon
+
+Crete and retrieve AuthToken from https://accounts.zoho.com/apiauthtoken/nb/create and set the AuthToken and Organization ID in the constructor. 
 
-All you need to do is to retrieve from your Zoho account and set the AuthToken and Organization ID in the constructor. 
 ```php
+
+use SudiptoChoudhury\Zoho\Subscriptions\Api;
+
+
 new Api([
     'authtoken' => '<<Zoho Subscriptions Auth Token>>', // https://accounts.zoho.com/apiauthtoken/nb/create
     'zohoOrgId' => '<<Zoho Organization ID>>',
diff --git a/composer.json b/composer.json
index 4348a2d..f543c49 100644
--- a/composer.json
+++ b/composer.json
@@ -23,7 +23,7 @@
     },
     "autoload": {
         "psr-4": {
-            "SudiptoChoudhury\\": "src/"
+            "SudiptoChoudhury\\Zoho\\Subscriptions\\": "src/Zoho/Subscriptions"
         }
     },
     "autoload-dev": {
diff --git a/src/zoho/subscriptions/Api.php b/src/Zoho/Subscriptions/Api.php
similarity index 95%
rename from src/zoho/subscriptions/Api.php
rename to src/Zoho/Subscriptions/Api.php
index 8706c98..cbf4931 100644
--- a/src/zoho/subscriptions/Api.php
+++ b/src/Zoho/Subscriptions/Api.php
@@ -185,6 +185,9 @@
  */
 class Api extends ApiForge
 {
+    // deprecated Authorization header
+    const AUTHTOKEN_HEADER = 'Zoho-authtoken {{authtoken}}';
+
     protected $loggerFile = __DIR__ . '/zoho-subscriptions-api-calls.log';
 
     protected $DEFAULT_API_JSON_PATH = './config/subscriptions.json';
@@ -193,13 +196,14 @@ class Api extends ApiForge
 
     protected $DEFAULTS = [
         'authtoken' => '',
+        'oauthtoken' => '',
         'zohoOrgId' => '',
         'tld' => 'com', // eu, in, com.au
         'client' => [
             'base_uri' => 'https://subscriptions.zoho.{{tld}}/api/v1/',
             'verify' => false,
             'headers' => [
-                'Authorization' => 'Zoho-authtoken {{authtoken}}',
+                'Authorization' => 'Zoho-oauthtoken {{oauthtoken}}',
                 'X-com-zoho-subscriptions-organizationid' => "{{zohoOrgId}}",
             ],
         ],
@@ -210,5 +214,25 @@ class Api extends ApiForge
         ],
     ];
 
+    /**
+     * @param array $options
+     *
+     * @return \SudiptoChoudhury\Zoho\Subscriptions\Api
+     */
+    protected function setOptions($options = [])
+    {
+        // authtoken is deprecated, apply it until discontinued
+        $authtoken = $options['authtoken'] ?? null;
+        if ($authtoken) {
+            $headers = $this->DEFAULTS['client']['headers'] ?? null;
+            if ($headers) {
+                $auth = $headers['Authorization'] ?? null;
+                if ($auth) {
+                    $this->DEFAULTS['client']['headers']['Authorization'] = static::AUTHTOKEN_HEADER;
+                }
+            }
+        }
+        return parent::setOptions($options);
+    }
 
 }
\ No newline at end of file
diff --git a/src/zoho/subscriptions/Import.php b/src/Zoho/Subscriptions/Import.php
similarity index 100%
rename from src/zoho/subscriptions/Import.php
rename to src/Zoho/Subscriptions/Import.php
diff --git a/src/zoho/subscriptions/config/postman.json b/src/Zoho/Subscriptions/config/postman.json
similarity index 100%
rename from src/zoho/subscriptions/config/postman.json
rename to src/Zoho/Subscriptions/config/postman.json
diff --git a/src/zoho/subscriptions/config/subscriptions.json b/src/Zoho/Subscriptions/config/subscriptions.json
similarity index 100%
rename from src/zoho/subscriptions/config/subscriptions.json
rename to src/Zoho/Subscriptions/config/subscriptions.json
diff --git a/src/zoho/subscriptions/config/subscriptions.php b/src/Zoho/Subscriptions/config/subscriptions.php
similarity index 100%
rename from src/zoho/subscriptions/config/subscriptions.php
rename to src/Zoho/Subscriptions/config/subscriptions.php