diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index f02e2e9..f8560c4 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -3,9 +3,11 @@ on:
   push:
     branches:
       - 2.x
+      - 3.x
   pull_request:
     branches:
       - 2.x
+      - 3.x
 
 jobs:
   test:
@@ -18,10 +20,11 @@ jobs:
       fail-fast: false
       matrix:
         php-version:
-          - "7.2"
-          - "7.3"
           - "7.4"
           - "8.0"
+          - "8.1"
+          - "8.2"
+          - "8.3"
         composer-version:
           - "2"
     steps:
diff --git a/composer.json b/composer.json
index 4d7f19d..243e287 100644
--- a/composer.json
+++ b/composer.json
@@ -4,17 +4,19 @@
     "type": "library",
     "keywords": ["payment"],
     "require": {
-        "php": "^7.2 || ^8.0",
+        "php": "^7.4 || ^8.0",
         "psr/http-message": "^1.0",
         "psr/http-client-implementation": "^1.0",
         "php-http/message": "^1.6",
         "php-http/httplug": "^1.0 || ^2.0",
         "php-http/discovery": "^1.17",
         "eloquent/enumeration": "^5.1",
-        "jms/serializer": "^1.8 || ^3.0"
+        "jms/serializer": "^1.8 || ^3.0",
+        "doctrine/annotations": "^2.0"
     },
     "require-dev": {
         "guzzlehttp/guzzle": "^7",
+        "php-http/guzzle7-adapter": "^1",
         "phpunit/phpunit": ">=5 <9",
         "symfony/yaml": "^2.0",
         "symfony/filesystem": "^3.1",
diff --git a/phpstan-baseline.neon b/phpstan-baseline.neon
index adb7a80..2c52e92 100644
--- a/phpstan-baseline.neon
+++ b/phpstan-baseline.neon
@@ -15,14 +15,6 @@ parameters:
 			count: 2
 			path: src/Exceptions/VippsException.php
 
-		-
-			message: """
-				#^Call to deprecated method getOrderStatus\\(\\) of class zaporylie\\\\Vipps\\\\Api\\\\PaymentInterface\\:
-				Get order status was deprecated and can be removed in version 3\\.0\\.$#
-			"""
-			count: 1
-			path: test/Integration/Api/PaymentsTest.php
-
 		-
 			message: "#^Call to an undefined static method zaporylie\\\\Vipps\\\\Endpoint\\:\\:error\\(\\)\\.$#"
 			count: 1
diff --git a/src/Client.php b/src/Client.php
index 4db8f09..b2040f3 100644
--- a/src/Client.php
+++ b/src/Client.php
@@ -10,6 +10,7 @@
 use Http\Discovery\Psr18ClientDiscovery;
 use Psr\Http\Client\ClientInterface as HttpClientInterface;
 use Psr\Http\Message\RequestFactoryInterface;
+use Psr\Http\Message\StreamFactoryInterface;
 use zaporylie\Vipps\Authentication\TokenMemoryCacheStorage;
 use zaporylie\Vipps\Authentication\TokenStorageInterface;
 use zaporylie\Vipps\Exceptions\Client\InvalidArgumentException;
@@ -32,6 +33,11 @@ class Client implements ClientInterface
      */
     protected $requestFactory;
 
+    /**
+     * @var \Psr\Http\Message\StreamFactoryInterface
+     */
+    protected StreamFactoryInterface $streamFactory;
+
     /**
      * @var string
      */
@@ -193,6 +199,17 @@ public function getRequestFactory(): RequestFactoryInterface
         return $this->requestFactory;
     }
 
+    /**
+     * {@inheritdoc}
+     */
+    public function getStreamFactory(): StreamFactoryInterface
+    {
+        if (!isset($this->streamFactory)) {
+            $this->streamFactory = Psr17FactoryDiscovery::findStreamFactory();
+        }
+        return $this->streamFactory;
+    }
+
     /**
      * Use this static method to get default HTTP Client.
      *
diff --git a/src/ClientInterface.php b/src/ClientInterface.php
index 14a68af..399ec64 100644
--- a/src/ClientInterface.php
+++ b/src/ClientInterface.php
@@ -4,6 +4,7 @@
 
 use Psr\Http\Client\ClientInterface as HttpClientInterface;
 use Psr\Http\Message\RequestFactoryInterface;
+use Psr\Http\Message\StreamFactoryInterface;
 use zaporylie\Vipps\Authentication\TokenStorageInterface;
 
 interface ClientInterface
@@ -69,9 +70,16 @@ public function getHttpClient() : HttpClientInterface;
     public function setHttpClient(?HttpClientInterface $httpClient);
 
     /**
-     * Gets messageFactory value.
+     * Gets requestFactoru value.
      *
      * @return \Psr\Http\Message\RequestFactoryInterface
      */
     public function getRequestFactory(): RequestFactoryInterface;
+
+    /**
+     * Gets streamFactory value.
+     *
+     * @return \Psr\Http\Message\StreamFactoryInterface
+     */
+    public function getStreamFactory(): StreamFactoryInterface;
 }
diff --git a/src/Resource/Authorization/GetToken.php b/src/Resource/Authorization/GetToken.php
index ac12b83..99be069 100644
--- a/src/Resource/Authorization/GetToken.php
+++ b/src/Resource/Authorization/GetToken.php
@@ -23,7 +23,7 @@ class GetToken extends ResourceBase
     /**
      * @var string
      */
-    protected $path = '/accessToken/get';
+    protected $path = '/accesstoken/get';
 
     /**
      * GetToken constructor.
diff --git a/src/Resource/ResourceBase.php b/src/Resource/ResourceBase.php
index b243df9..328d104 100644
--- a/src/Resource/ResourceBase.php
+++ b/src/Resource/ResourceBase.php
@@ -10,8 +10,6 @@
 
 use Doctrine\Common\Annotations\AnnotationRegistry;
 use Http\Client\Exception\HttpException;
-use Http\Client\HttpAsyncClient;
-use Http\Client\HttpClient;
 use JMS\Serializer\SerializerBuilder;
 use Psr\Http\Client\ClientInterface;
 use Psr\Http\Message\RequestInterface;
@@ -206,12 +204,16 @@ protected function handleRequest(RequestInterface $request)
      */
     protected function getRequest()
     {
-        return $this->app->getClient()->getRequestFactory()->createRequest(
+        $request = $this->app->getClient()->getRequestFactory()->createRequest(
             $this->getMethod(),
-            $this->getUri($this->getPath()),
-            $this->getHeaders(),
-            $this->getBody()
+            $this->getUri($this->getPath())
         );
+        $body = $this->app->getClient()->getStreamFactory()->createStream($this->getBody());
+        $request = $request->withBody($body);
+        foreach ($this->getHeaders() as $header => $value) {
+            $request = $request->withAddedHeader($header, $value);
+        }
+        return $request;
     }
 
     /**
diff --git a/test/Unit/Resource/Authorization/GetTokenTest.php b/test/Unit/Resource/Authorization/GetTokenTest.php
index 665420b..b32498b 100644
--- a/test/Unit/Resource/Authorization/GetTokenTest.php
+++ b/test/Unit/Resource/Authorization/GetTokenTest.php
@@ -65,7 +65,7 @@ public function testMethod()
      */
     public function testPath()
     {
-        $this->assertEquals('/accessToken/get', $this->resource->getPath());
+        $this->assertEquals('/accesstoken/get', $this->resource->getPath());
     }
 
     /**