diff --git a/spec/Client/PayPalClientSpec.php b/spec/Client/PayPalClientSpec.php
index 0a9f1dfb..3630d963 100644
--- a/spec/Client/PayPalClientSpec.php
+++ b/spec/Client/PayPalClientSpec.php
@@ -53,14 +53,15 @@ function let(
 
         $this->beConstructedWith(
             $client,
-            $requestFactory,
-            $streamFactory,
             $logger,
             $uuidProvider,
             $payPalConfigurationProvider,
             $channelContext,
             'https://test-api.paypal.com/',
-            5
+            5,
+            false,
+            $requestFactory,
+            $streamFactory,
         );
     }
 
@@ -140,15 +141,15 @@ function it_logs_all_requests_if_logging_level_is_increased(
     ): void {
         $this->beConstructedWith(
             $client,
-            $requestFactory,
-            $streamFactory,
             $logger,
             $uuidProvider,
             $payPalConfigurationProvider,
             $channelContext,
             'https://test-api.paypal.com/',
             5,
-            true
+            true,
+            $requestFactory,
+            $streamFactory,
         );
 
         $channelContext->getChannel()->willReturn($channel);
diff --git a/src/Api/WebhookApi.php b/src/Api/WebhookApi.php
index 1004f6de..d13e2b33 100644
--- a/src/Api/WebhookApi.php
+++ b/src/Api/WebhookApi.php
@@ -4,6 +4,7 @@
 
 namespace Sylius\PayPalPlugin\Api;
 
+use GuzzleHttp\ClientInterface as GuzzleClientInterface;
 use Psr\Http\Client\ClientInterface;
 use Psr\Http\Message\RequestFactoryInterface;
 use Psr\Http\Message\StreamFactoryInterface;
@@ -11,15 +12,36 @@
 final class WebhookApi implements WebhookApiInterface
 {
     public function __construct(
-        private readonly ClientInterface $client,
+        private readonly GuzzleClientInterface|ClientInterface $client,
         private readonly string $baseUrl,
-        private readonly RequestFactoryInterface $requestFactory,
-        private readonly StreamFactoryInterface $streamFactory,
+        private readonly ?RequestFactoryInterface $requestFactory = null,
+        private readonly ?StreamFactoryInterface $streamFactory = null,
     ) {
+        if ($this->client instanceof GuzzleClientInterface) {
+            trigger_deprecation(
+                'sylius/paypal-plugin',
+                '1.6',
+                'Passing GuzzleHttp\ClientInterface as a first argument in the constructor is deprecated and will be removed. Use Psr\Http\Client\ClientInterface instead.',
+                self::class,
+            );
+        }
+
+        if (null === $this->requestFactory && null === $this->streamFactory) {
+            trigger_deprecation(
+                'sylius/paypal-plugin',
+                '1.6',
+                'Not passing $requestFactory and $streamFactory to %s constructor is deprecated and will be removed',
+                self::class,
+            );
+        }
     }
 
     public function register(string $token, string $webhookUrl): array
     {
+        if ($this->client instanceof GuzzleClientInterface && null === $this->requestFactory && null === $this->streamFactory) {
+            return $this->legacyRegister($token, $webhookUrl);
+        }
+
         $request = $this->requestFactory->createRequest('POST', $this->baseUrl . 'v1/notifications/webhooks')
             ->withHeader('Authorization', 'Bearer ' . $token)
             ->withHeader('Content-Type', 'application/json')
@@ -42,4 +64,23 @@ public function register(string $token, string $webhookUrl): array
 
         return (array) json_decode($response->getBody()->getContents(), true);
     }
+
+    private function legacyRegister(string $token, string $webhookUrl): array
+    {
+        $response = $this->client->request('POST', $this->baseUrl . 'v1/notifications/webhooks', [
+            'headers' => [
+                'Authorization' => 'Bearer ' . $token,
+                'Content-Type' => 'application/json',
+                'Accept' => 'application/json',
+            ],
+            'json' => [
+                'url' => preg_replace('/^http:/i', 'https:', $webhookUrl),
+                'event_types' => [
+                    ['name' => 'PAYMENT.CAPTURE.REFUNDED'],
+                ],
+            ],
+        ]);
+
+        return (array) json_decode($response->getBody()->getContents(), true);
+    }
 }
diff --git a/src/Client/PayPalClient.php b/src/Client/PayPalClient.php
index 7135a449..c5434b0d 100644
--- a/src/Client/PayPalClient.php
+++ b/src/Client/PayPalClient.php
@@ -13,6 +13,7 @@
 
 namespace Sylius\PayPalPlugin\Client;
 
+use GuzzleHttp\ClientInterface as GuzzleClientInterface;
 use GuzzleHttp\Exception\ConnectException;
 use GuzzleHttp\Exception\RequestException;
 use Psr\Http\Client\ClientInterface;
@@ -30,9 +31,7 @@
 final class PayPalClient implements PayPalClientInterface
 {
     public function __construct(
-        private readonly ClientInterface $client,
-        private readonly RequestFactoryInterface $requestFactory,
-        private readonly StreamFactoryInterface $streamFactory,
+        private readonly GuzzleClientInterface|ClientInterface $client,
         private readonly LoggerInterface $logger,
         private readonly UuidProviderInterface $uuidProvider,
         private readonly PayPalConfigurationProviderInterface $payPalConfigurationProvider,
@@ -40,7 +39,26 @@ public function __construct(
         private readonly string $baseUrl,
         private int $requestTrialsLimit,
         private readonly bool $loggingLevelIncreased = false,
+        private readonly ?RequestFactoryInterface $requestFactory = null,
+        private readonly ?StreamFactoryInterface $streamFactory = null,
     ) {
+        if ($this->client instanceof GuzzleClientInterface) {
+            trigger_deprecation(
+                'sylius/paypal-plugin',
+                '1.6',
+                'Passing GuzzleHttp\ClientInterface as a first argument in the constructor is deprecated and will be removed. Use Psr\Http\Client\ClientInterface instead.',
+                self::class,
+            );
+        }
+
+        if (null === $this->requestFactory && null === $this->streamFactory) {
+            trigger_deprecation(
+                'sylius/paypal-plugin',
+                '1.6',
+                'Not passing $requestFactory and $streamFactory to %s constructor is deprecated and will be removed',
+                self::class,
+            );
+        }
     }
 
     public function authorize(string $clientId, string $clientSecret): array
@@ -125,43 +143,49 @@ private function request(string $method, string $url, string $token, array $data
     private function doRequest(string $method, string $fullUrl, array $options): ResponseInterface
     {
         try {
-            $request = $this->requestFactory->createRequest($method, $fullUrl);
-
-            if (isset($options['auth'])) {
-                $request = $request->withHeader(
-                    'Authorization',
-                    sprintf(
-                        'Basic %s',
-                        base64_encode(sprintf('%s:%s', $options['auth'][0], $options['auth'][1])),
-                    ),
-                );
-            }
+            if ($this->client instanceof GuzzleClientInterface && null === $this->requestFactory && null === $this->streamFactory) {
+                $response = $this->client->request($method, $fullUrl, $options);
+            } else {
+                $request = $this->requestFactory->createRequest($method, $fullUrl);
+
+                if (isset($options['auth'])) {
+                    $request = $request->withHeader(
+                        'Authorization',
+                        sprintf(
+                            'Basic %s',
+                            base64_encode(sprintf('%s:%s', $options['auth'][0], $options['auth'][1])),
+                        ),
+                    );
+                }
 
-            if (isset($options['form_params'])) {
-                $request = $request->withHeader('Content-Type', 'application/x-www-form-urlencoded');
-                $request = $request->withBody(
-                    $this->streamFactory->createStream(http_build_query(
-                        $options['form_params'],
-                        '',
-                        '&',
-                        \PHP_QUERY_RFC1738,
-                    )),
-                );
-            }
+                if (isset($options['form_params'])) {
+                    $request = $request->withHeader('Content-Type', 'application/x-www-form-urlencoded');
+                    $request = $request->withBody(
+                        $this->streamFactory->createStream(
+                            http_build_query(
+                                $options['form_params'],
+                                '',
+                                '&',
+                                \PHP_QUERY_RFC1738,
+                            ),
+                        ),
+                    );
+                }
 
-            if (isset($options['json'])) {
-                $request = $request->withBody(
-                    $this->streamFactory->createStream(json_encode($options['json'])),
-                );
-            }
+                if (isset($options['json'])) {
+                    $request = $request->withBody(
+                        $this->streamFactory->createStream(json_encode($options['json'])),
+                    );
+                }
 
-            if (isset($options['headers'])) {
-                foreach ($options['headers'] as $header => $headerValue) {
-                    $request = $request->withHeader($header, $headerValue);
+                if (isset($options['headers'])) {
+                    foreach ($options['headers'] as $header => $headerValue) {
+                        $request = $request->withHeader($header, $headerValue);
+                    }
                 }
-            }
 
-            $response = $this->client->sendRequest($request);
+                $response = $this->client->sendRequest($request);
+            }
         } catch (ConnectException $exception) {
             --$this->requestTrialsLimit;
             if ($this->requestTrialsLimit === 0) {
diff --git a/src/Resources/config/services/api.xml b/src/Resources/config/services/api.xml
index adadf6bb..5c203c12 100644
--- a/src/Resources/config/services/api.xml
+++ b/src/Resources/config/services/api.xml
@@ -12,8 +12,6 @@
             class="Sylius\PayPalPlugin\Client\PayPalClient"
         >
             <argument type="service" id="Http\Discovery\Psr18Client" />
-            <argument type="service" id="Psr\Http\Message\RequestFactoryInterface" />
-            <argument type="service" id="Psr\Http\Message\StreamFactoryInterface" />
             <argument type="service" id="monolog.logger.paypal" />
             <argument type="service" id="Sylius\PayPalPlugin\Provider\UuidProviderInterface" />
             <argument type="service" id="Sylius\PayPalPlugin\Provider\PayPalConfigurationProviderInterface" />
@@ -21,6 +19,8 @@
             <argument>%sylius.pay_pal.api_base_url%</argument>
             <argument>%sylius.pay_pal.request_trials_limit%</argument>
             <argument>%sylius.paypal.logging.increased%</argument>
+            <argument type="service" id="Psr\Http\Message\RequestFactoryInterface" />
+            <argument type="service" id="Psr\Http\Message\StreamFactoryInterface" />
         </service>
 
         <service