diff --git a/README.md b/README.md
new file mode 100644
index 0000000..b613e03
--- /dev/null
+++ b/README.md
@@ -0,0 +1,51 @@
+# Shoptet SDK
+Simple Shoptet SDK.
+
+## Installation
+```shell
+composer require adbros/shoptet-sdk
+```
+
+## Usage
+
+```php
+<?php declare(strict_types = 1);
+
+use Adbros\Shoptet\OAuth;
+use Adbros\Shoptet\Sdk;
+
+// Initialize OAuth
+$oAuth = new OAuth(
+	clientId: getenv('CLIENT_ID'),
+	clientSecret: getenv('CLIENT_SECRET'),
+	eshopUrl: getenv('ESHOP_URL'),
+);
+
+// Get oAuthAccessToken in installation process
+$oAuthAccessToken = $oAuth->getOAuthAccessToken(
+	code: $_GET['code'],
+	redirectUri: 'https://example.com/install',
+);
+
+// Get apiAccessToken before API call
+$apiAccessToken = $oAuth->getApiAccessToken(
+	oAuthAccessToken: $oAuthAccessToken->accessToken,
+);
+
+// Initialize SDK
+$sdk = new Sdk(
+	apiAccessToken: $apiAccessToken->accessToken,
+);
+
+// Get customers
+$page = 1;
+
+do {
+	$customers = $sdk->getCustomers($page);
+	
+	foreach ($customers->customers as $customer) {
+		// Get customer
+		$customerDetail = $sdk->getCustomer($customer->guid);
+	}
+} while ($page++ < $customers->paginator->pageCount);
+```
diff --git a/src/OAuth.php b/src/OAuth.php
index 432148d..1feb8fc 100644
--- a/src/OAuth.php
+++ b/src/OAuth.php
@@ -14,14 +14,20 @@ class OAuth
 
 	private Client $httpClient;
 
+	private readonly string $oAuthAccessTokenUrl;
+
+	private readonly string $apiAccessTokenUrl;
+
 	public function __construct(
 		private readonly string $clientId,
 		private readonly string $clientSecret,
-		private readonly string $oAuthAccessTokenUrl,
-		private readonly string $apiAccessTokenUrl,
+		private readonly string $eshopUrl,
 	)
 	{
 		$this->httpClient = new Client();
+
+		$this->oAuthAccessTokenUrl = rtrim($this->eshopUrl, '/') . '/action/ApiOAuthServer/token';
+		$this->apiAccessTokenUrl = rtrim($this->eshopUrl, '/') . '/action/ApiOAuthServer/getAccessToken';
 	}
 
 	public function getOAuthAccessToken(string $code, string $redirectUri): OAuthAccessToken // @phpcs:ignore Generic.NamingConventions.CamelCapsFunctionName.ScopeNotCamelCaps