diff --git a/src/Controller/Admin/PeakWMSController.php b/src/Controller/Admin/PeakWMSController.php
index f43dd2f..a3a66b9 100644
--- a/src/Controller/Admin/PeakWMSController.php
+++ b/src/Controller/Admin/PeakWMSController.php
@@ -4,6 +4,7 @@
 
 namespace Setono\SyliusPeakWMSPlugin\Controller\Admin;
 
+use Setono\PeakWMS\Client\ClientInterface;
 use Setono\SyliusPeakWMSPlugin\Message\Command\RegisterWebhooks;
 use Setono\SyliusPeakWMSPlugin\Registrar\WebhookRegistrarInterface;
 use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
@@ -16,12 +17,22 @@ final class PeakWMSController extends AbstractController
     public function __construct(
         private readonly MessageBusInterface $commandBus,
         private readonly WebhookRegistrarInterface $webhookRegistrar,
+        private readonly ClientInterface $client,
     ) {
     }
 
     public function index(): Response
     {
+        $apiError = false;
+
+        try {
+            $this->client->ping();
+        } catch (\Throwable) {
+            $apiError = 'There was an error connecting to the API. Please check your credentials and try again. If you continue to experience issues, did you forget to enable/disable the sandbox?';
+        }
+
         return $this->render('@SetonoSyliusPeakWMSPlugin/admin/peak_wms/index.html.twig', [
+            'apiError' => $apiError,
             'webhooksShouldBeRegistered' => $this->webhookRegistrar->outOfDate(),
         ]);
     }
diff --git a/src/Resources/config/services/client.xml b/src/Resources/config/services/client.xml
index b91a820..2ba0a44 100644
--- a/src/Resources/config/services/client.xml
+++ b/src/Resources/config/services/client.xml
@@ -2,13 +2,15 @@
 <container xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://symfony.com/schema/dic/services"
            xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd">
     <services>
-        <service id="setono_sylius_peak_wms.client"
-                 class="Setono\PeakWMS\Client\Client">
+        <service id="setono_sylius_peak_wms.client" class="Setono\PeakWMS\Client\Client">
             <argument>%setono_sylius_peak_wms.api_key%</argument>
 
             <call method="setLogger">
                 <argument type="service" id="logger"/>
             </call>
+            <call method="useSandbox">
+                <argument>%kernel.debug%</argument>
+            </call>
         </service>
     </services>
 </container>
diff --git a/src/Resources/config/services/controller.xml b/src/Resources/config/services/controller.xml
index ff51798..4593721 100644
--- a/src/Resources/config/services/controller.xml
+++ b/src/Resources/config/services/controller.xml
@@ -6,6 +6,7 @@
                  class="Setono\SyliusPeakWMSPlugin\Controller\Admin\PeakWMSController" public="true">
             <argument type="service" id="setono_sylius_peak_wms.command_bus"/>
             <argument type="service" id="setono_sylius_peak_wms.registrar.webhook"/>
+            <argument type="service" id="setono_sylius_peak_wms.client"/>
 
             <call method="setContainer">
                 <argument type="service" id="service_container"/>
diff --git a/src/Resources/views/admin/peak_wms/index.html.twig b/src/Resources/views/admin/peak_wms/index.html.twig
index 4e0fe5b..01bba9a 100644
--- a/src/Resources/views/admin/peak_wms/index.html.twig
+++ b/src/Resources/views/admin/peak_wms/index.html.twig
@@ -13,18 +13,31 @@
 
     <div class="ui hidden divider"></div>
 
-    <div class="ui grid">
-        <div class="eight wide column">
-            <div class="ui segment">
-                <h4 class="ui header">{{ 'setono_sylius_peak_wms.ui.webhooks'|trans }}</h4>
+    {% if apiError %}
+        <div class="ui grid">
+            <div class="eight wide column">
+                <div class="ui segment">
+                    <div class="ui negative message">
+                        <div class="header">There was an error connecting to the API</div>
+                        <p>{{ apiError }}</p>
+                    </div>
+                </div>
+            </div>
+        </div>
+    {% else %}
+        <div class="ui grid">
+            <div class="eight wide column">
+                <div class="ui segment">
+                    <h4 class="ui header">{{ 'setono_sylius_peak_wms.ui.webhooks'|trans }}</h4>
 
-                {% if webhooksShouldBeRegistered %}
-                    <p>{{ 'setono_sylius_peak_wms.ui.register_webhooks_information'|trans }}</p>
-                {% endif %}
-                <a href="{{ path('setono_sylius_peak_wms_admin_peak_wms_register_webhooks') }}" class="ui primary button">
-                    {{ 'setono_sylius_peak_wms.ui.register_webhooks'|trans }}
-                </a>
+                    {% if webhooksShouldBeRegistered %}
+                        <p>{{ 'setono_sylius_peak_wms.ui.register_webhooks_information'|trans }}</p>
+                    {% endif %}
+                    <a href="{{ path('setono_sylius_peak_wms_admin_peak_wms_register_webhooks') }}" class="ui primary button">
+                        {{ 'setono_sylius_peak_wms.ui.register_webhooks'|trans }}
+                    </a>
+                </div>
             </div>
         </div>
-    </div>
+    {% endif %}
 {% endblock %}