diff --git a/.github/workflows/continuous-integration.yml b/.github/workflows/continuous-integration.yml
index 3e8e5ba..cd35c66 100644
--- a/.github/workflows/continuous-integration.yml
+++ b/.github/workflows/continuous-integration.yml
@@ -2,7 +2,6 @@ name: "Continuous Integration"
 
 on:
   pull_request:
-  pull_request_target:
   push:
     branches:
       - master
diff --git a/src/Client.php b/src/Client.php
index c7229a9..293c479 100644
--- a/src/Client.php
+++ b/src/Client.php
@@ -15,7 +15,7 @@
 use function fopen;
 use function fwrite;
 
-final class Client
+final class Client implements GotenbergClientInterface
 {
     /** @var HttpClient */
     private $client;
@@ -30,7 +30,7 @@ public function __construct(string $apiURL, ?HttpClient $client = null)
     }
 
     /**
-     * Sends the given documents to the API and returns the response.
+     * {@inheritdoc}
      *
      * @throws ClientException
      * @throws Exception
@@ -41,7 +41,7 @@ public function post(GotenbergRequestInterface $request): ResponseInterface
     }
 
     /**
-     * Sends the given documents to the API, stores the resulting PDF in the given destination.
+     * {@inheritdoc}
      *
      * @throws ClientException
      * @throws RequestException
diff --git a/src/GotenbergClientInterface.php b/src/GotenbergClientInterface.php
new file mode 100644
index 0000000..4289fda
--- /dev/null
+++ b/src/GotenbergClientInterface.php
@@ -0,0 +1,20 @@
+<?php
+
+declare(strict_types=1);
+
+namespace TheCodingMachine\Gotenberg;
+
+use Psr\Http\Message\ResponseInterface;
+
+interface GotenbergClientInterface
+{
+    /**
+     * Sends the given documents to the API and returns the response.
+     */
+    public function post(GotenbergRequestInterface $request): ResponseInterface;
+
+    /**
+     * Sends the given documents to the API, stores the resulting PDF in the given destination.
+     */
+    public function store(GotenbergRequestInterface $request, string $destination): void;
+}