diff --git a/.github/workflows/backend.yml b/.github/workflows/backend.yml
new file mode 100644
index 0000000..b82b517
--- /dev/null
+++ b/.github/workflows/backend.yml
@@ -0,0 +1,13 @@
+name: FoF GeoIP PHP
+
+on: [workflow_dispatch, push, pull_request]
+
+jobs:
+  run:
+    uses: flarum/framework/.github/workflows/REUSABLE_backend.yml@main
+    with:
+      enable_backend_testing: false
+      enable_phpstan: true
+      php_versions: '["8.0", "8.1", "8.2"]'
+
+      backend_directory: .
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
deleted file mode 100644
index 91f877b..0000000
--- a/.github/workflows/build.yml
+++ /dev/null
@@ -1,31 +0,0 @@
-name: JavaScript
-
-on:
-  push:
-    branches:
-      - master
-
-jobs:
-  build:
-    name: JS / Build
-    runs-on: ubuntu-latest
-
-    steps:
-      - name: Check out code
-        uses: actions/checkout@v3
-
-      - name: Restore npm cache
-        uses: actions/cache@v3
-        with:
-          path: ~/.npm
-          key: ${{ runner.os }}-node-${{ hashFiles('js/package-lock.json') }}
-          restore-keys: |
-            ${{ runner.os }}-node-
-      # Our action will install npm, cd into `./js`, run `npm run build` and
-      # `npm run build-typings`, then commit and upload any changes
-      - name: Build production JS
-        uses: flarum/action-build@v3
-        with:
-          github_token: ${{ secrets.GITHUB_TOKEN }}
-          build_script: build
-          package_manager: npm
diff --git a/.github/workflows/frontend.yml b/.github/workflows/frontend.yml
new file mode 100644
index 0000000..bfa0c58
--- /dev/null
+++ b/.github/workflows/frontend.yml
@@ -0,0 +1,19 @@
+name: FoF GeoIP JS
+
+on: [workflow_dispatch, push, pull_request]
+
+jobs:
+  run:
+    uses: flarum/framework/.github/workflows/REUSABLE_frontend.yml@main
+    with:
+      enable_bundlewatch: false
+      enable_prettier: true
+      enable_typescript: true
+
+      frontend_directory: ./js
+      backend_directory: .
+      js_package_manager: npm
+      main_git_branch: master
+
+    secrets:
+      bundlewatch_github_token: ${{ secrets.BUNDLEWATCH_GITHUB_TOKEN }}
diff --git a/composer.json b/composer.json
index 6bb6bcc..50bbcb5 100644
--- a/composer.json
+++ b/composer.json
@@ -50,6 +50,21 @@
         },
         "flagrow": {
             "discuss": "https://discuss.flarum.org/d/21493"
+        },
+        "flarum-cli": {
+            "modules": {
+                "githubActions": true
+            }
         }
+    },
+    "require-dev": {
+        "flarum/phpstan": "*"
+    },
+    "scripts": {
+        "analyse:phpstan": "phpstan analyse",
+        "clear-cache:phpstan": "phpstan clear-result-cache"
+    },
+    "scripts-descriptions": {
+        "analyse:phpstan": "Run static analysis"
     }
 }
diff --git a/phpstan.neon b/phpstan.neon
new file mode 100644
index 0000000..03cf261
--- /dev/null
+++ b/phpstan.neon
@@ -0,0 +1,13 @@
+includes:
+  - vendor/flarum/phpstan/extension.neon
+
+parameters:
+  # The level will be increased in Flarum 2.0
+  level: 5
+  paths:
+    - extend.php
+    - src
+  excludePaths:
+    - *.blade.php
+  checkMissingIterableValueType: false
+  databaseMigrationsPath: ['migrations']
diff --git a/src/Api/Controller/ShowIpInfoController.php b/src/Api/Controller/ShowIpInfoController.php
index e62e13b..895904c 100644
--- a/src/Api/Controller/ShowIpInfoController.php
+++ b/src/Api/Controller/ShowIpInfoController.php
@@ -25,12 +25,8 @@ class ShowIpInfoController extends AbstractShowController
 {
     public $serializer = IPInfoSerializer::class;
 
-    protected $geoIP;
-
-    public function __construct(GeoIP $geoIP)
-    {
-        $this->geoIP = $geoIP;
-    }
+    public function __construct(protected GeoIP $geoIP)
+    {}
 
     /**
      * Get the IP information, either from the database or by performing a lookup.
diff --git a/src/Api/ServiceResponse.php b/src/Api/ServiceResponse.php
index d30a48f..b4a625f 100644
--- a/src/Api/ServiceResponse.php
+++ b/src/Api/ServiceResponse.php
@@ -49,7 +49,7 @@ class ServiceResponse implements \JsonSerializable
     private $threat_type;
 
     /**
-     * @var
+     * @var ?string
      */
     private $error;
 
@@ -65,6 +65,11 @@ public function setCountryCode(?string $country_code)
         return $this;
     }
 
+    public function getCountryCode(): ?string
+    {
+        return $this->country_code;
+    }
+
     public function setZipCode(?string $zip_code)
     {
         $this->zip_code = $zip_code;
@@ -72,6 +77,11 @@ public function setZipCode(?string $zip_code)
         return $this;
     }
 
+    public function getZipCode(): ?string
+    {
+        return $this->zip_code;
+    }
+
     public function setIsp(?string $isp)
     {
         $this->isp = $isp;
@@ -79,6 +89,11 @@ public function setIsp(?string $isp)
         return $this;
     }
 
+    public function getIsp(): ?string
+    {
+        return $this->isp;
+    }
+
     public function setOrganization(?string $organization)
     {
         $this->organization = $organization;
@@ -86,6 +101,11 @@ public function setOrganization(?string $organization)
         return $this;
     }
 
+    public function getOrganization(): ?string
+    {
+        return $this->organization;
+    }
+
     public function setThreatLevel(?string $level)
     {
         $this->threat_level = $level;
@@ -93,6 +113,11 @@ public function setThreatLevel(?string $level)
         return $this;
     }
 
+    public function getThreatLevel(): ?string
+    {
+        return $this->threat_level;
+    }
+
     public function setThreatType(?string $types)
     {
         $this->threat_type = $types;
@@ -100,6 +125,11 @@ public function setThreatType(?string $types)
         return $this;
     }
 
+    public function getThreatType(): ?string
+    {
+        return $this->threat_type;
+    }
+
     public function setError(?string $error)
     {
         $this->error = $error;
@@ -107,6 +137,11 @@ public function setError(?string $error)
         return $this;
     }
 
+    public function getError(): ?string
+    {
+        return $this->error;
+    }
+
     public function toJson()
     {
         return json_decode(json_encode($this), true);
diff --git a/src/Api/Services/IPData.php b/src/Api/Services/IPData.php
index cbdacf6..f76b1df 100644
--- a/src/Api/Services/IPData.php
+++ b/src/Api/Services/IPData.php
@@ -57,8 +57,10 @@ protected function parseResponse(object $body): ServiceResponse
 
         if (isset($body->asn->type)) {
             if ($body->asn->type == 'isp') {
+                /** @phpstan-ignore-next-line */
                 $response->setIsp($body->asn->name);
             } else {
+                /** @phpstan-ignore-next-line */
                 $response->setOrganization($body->asn->name);
             }
         }
diff --git a/src/IPInfo.php b/src/IPInfo.php
index ac9c034..5726951 100644
--- a/src/IPInfo.php
+++ b/src/IPInfo.php
@@ -14,14 +14,14 @@
 use Flarum\Database\AbstractModel;
 
 /**
- * @property string address
- * @property string|null countryCode
- * @property string|null zipCode
- * @property string|null isp
- * @property string|null organization
- * @property string|null threat_level
- * @property string|null threat_types
- * @property string|null error
+ * @property string $address
+ * @property string|null $country_code
+ * @property string|null $zip_code
+ * @property string|null $isp
+ * @property string|null $organization
+ * @property string|null $threat_level
+ * @property string|null $threat_types
+ * @property string|null $error
  */
 class IPInfo extends AbstractModel
 {
diff --git a/src/IPInfoSerializer.php b/src/IPInfoSerializer.php
index 22c8d7b..09f8aae 100644
--- a/src/IPInfoSerializer.php
+++ b/src/IPInfoSerializer.php
@@ -12,21 +12,24 @@
 namespace FoF\GeoIP;
 
 use Flarum\Api\Serializer\AbstractSerializer;
+use InvalidArgumentException;
 
 class IPInfoSerializer extends AbstractSerializer
 {
-    /**
-     * {@inheritdoc}
-     */
     protected $type = 'ip_info';
 
     /**
-     * {@inheritdoc}
+     * Undocumented function
+     *
+     * @param IPInfo $ip
+     * @return array
      */
-    protected function getDefaultAttributes($ip)
+    protected function getDefaultAttributes($ip): array
     {
-        if (!$ip) {
-            return [];
+        if (! ($ip instanceof IPInfo)) {
+            throw new InvalidArgumentException(
+                get_class($this).' can only serialize instances of '.IPInfo::class
+            );
         }
 
         return [
@@ -35,13 +38,14 @@ protected function getDefaultAttributes($ip)
             'isp'               => $ip->isp,
             'organization'      => $ip->organization,
             'threatLevel'       => $ip->threat_level,
-            'threatType'        => $ip->threat_type,
+            'threatType'        => $ip->threat_types,
             'error'             => $ip->error,
         ];
     }
 
     /**
-     * {@inheritdoc}
+     * @param IPInfo $model
+     * @return string
      */
     public function getId($model)
     {
diff --git a/src/Listeners/RemoveErrorsOnSettingsUpdate.php b/src/Listeners/RemoveErrorsOnSettingsUpdate.php
index bb33d8a..284ec4b 100644
--- a/src/Listeners/RemoveErrorsOnSettingsUpdate.php
+++ b/src/Listeners/RemoveErrorsOnSettingsUpdate.php
@@ -17,14 +17,8 @@
 
 class RemoveErrorsOnSettingsUpdate
 {
-    /**
-     * @var SettingsRepositoryInterface
-     */
-    private $settings;
-
-    public function __construct(SettingsRepositoryInterface $settings)
+    public function __construct(protected SettingsRepositoryInterface $settings)
     {
-        $this->settings = $settings;
     }
 
     public function handle(Saving $event)