diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000000000000000000000000000000000000..9ab59b180fb670006ac910a2bc4524a1376dcea0
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,15 @@
+
+# Ignore developer files when exporting
+.gitattributes         export-ignore
+.gitignore             export-ignore
+.gitlab-ci.yml         export-ignore
+.phive                 export-ignore
+captainhook.json       export-ignore
+phpcs.xml.dist         export-ignore
+phpstan-baseline.neon  export-ignore
+phpstan.dist.neon      export-ignore
+phpunit.dist.xml       export-ignore
+tests                  export-ignore
+
+# Explicitly set file type and line endings for PHP files, improves git diff output
+*.php     text eol=lf diff=php
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
index f4da20891502a3992abf2981d8f6c46e33868ab6..e25391c1f85364060ac958b37e8e35c6c51beafe 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,11 @@
 tools/
 phpstan.neon
 .phpunit.result.cache
-phpunit.xml
\ No newline at end of file
+phpunit.xml
+tools/
+
+phpstan.neon
+
+.phpunit.result.cache
+
+phpunit.xml
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index b8d20acb6c365ad8036a7b36d47dabd876d08efa..b5a64b401e554341447c74d7cf93a89ac95a3fdb 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,3 +1,17 @@
 include:
-  - project: 'quiqqer/stabilization/semantic-release'
-    file: '/ci-templates/.gitlab-ci.yml'
+  - component: dev.quiqqer.com/quiqqer/stabilization/ci-cd-components/quiqqer-package-bundle/quiqqer-package-bundle@main
+
+# Remove the entire phpunit-php8.1 block, to allow PHPUnit to run on PHP 8.1 in your pipeline
+phpunit-php8.1:
+  rules:
+    - when: never
+
+# Remove the entire phpunit-php8.2 block, to allow PHPUnit to run on PHP 8.2 in your pipeline
+phpunit-php8.2:
+  rules:
+    - when: never
+
+# Remove the entire phpunit-php8.3 block, to allow PHPUnit to run on PHP 8.3 in your pipeline
+phpunit-php8.3:
+  rules:
+    - when: never
\ No newline at end of file
diff --git a/.phive/phars.xml b/.phive/phars.xml
index a1315a09b4adad780a9c5e52f74835c708c5c7d5..5bfa092bfad10dad9d23240281a5a2041acb815b 100644
--- a/.phive/phars.xml
+++ b/.phive/phars.xml
@@ -1,4 +1,8 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <phive xmlns="https://phar.io/phive">
-  <phar name="phpstan" version="^1.10.67" installed="1.10.67" location="./tools/phpstan" copy="false"/>
+  <phar name="phpstan" version="1.11.8" installed="1.11.8" location="./tools/phpstan" copy="false"/>
+  <phar name="phpunit" version="^10.5.20" installed="10.5.20" location="./tools/phpunit" copy="false"/>
+  <phar name="phpcs" version="^3.10.1" installed="3.10.1" location="./tools/phpcs" copy="false"/>
+  <phar name="phpcbf" version="^3.10.1" installed="3.10.1" location="./tools/phpcbf" copy="false"/>
+  <phar name="captainhook" version="^5.23.3" installed="5.23.3" location="./tools/captainhook" copy="false"/>
 </phive>
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
new file mode 100644
index 0000000000000000000000000000000000000000..4a69a59b440e5beec561eca1e341509bd5a18688
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,3 @@
+# Contributing
+
+This package follows the [QUIQQER contribution guidelines](https://dev.quiqqer.com/quiqqer/stabilization/documentation/-/wikis/home).
\ No newline at end of file
diff --git a/captainhook.json b/captainhook.json
new file mode 100644
index 0000000000000000000000000000000000000000..3702e1a358868bedd5ff4c7eae40bb1abb589267
--- /dev/null
+++ b/captainhook.json
@@ -0,0 +1,13 @@
+{
+    "pre-commit": {
+        "enabled": true,
+        "actions": [
+            {
+                "action": "\\CaptainHook\\App\\Hook\\PHP\\Action\\Linting"
+            },
+            {
+                "action": "composer test"
+            }
+        ]
+    }
+}
\ No newline at end of file
diff --git a/composer.json b/composer.json
index 98b6c3386d1253df2994068a2b0ee96b00f0b2e1..46d2b55e07a85450f5a2cf611c6e16b2a3d2b443 100644
--- a/composer.json
+++ b/composer.json
@@ -29,5 +29,47 @@
       "QUI\\ERP\\Discount\\": "src/QUI/ERP/Discount",
       "QUITests\\ERP\\Discount\\": "tests/QUITests/ERP/Discount"
     }
+  },
+  "scripts": {
+    "test": [
+      "@dev:lint",
+      "@dev:phpunit"
+    ],
+    "dev:phpunit": "./tools/phpunit",
+    "dev:lint": [
+      "@dev:lint:phpstan",
+      "@dev:lint:style"
+    ],
+    "dev:lint:phpstan": "./tools/phpstan",
+    "dev:lint:style": "./tools/phpcs",
+    "dev:lint:style:fix": "./tools/phpcbf",
+    "dev:init": [
+      "@dev:init:check-requirements",
+      "@dev:init:tools",
+      "@dev:init:git-hooks"
+    ],
+    "dev:init:check-requirements": [
+      "which composer > /dev/null || (echo 'Error: composer has to be globally installed'; exit 1)",
+      "which phive > /dev/null || (echo 'Error: PHIVE has to be globally installed'; exit 1)"
+    ],
+    "dev:init:tools": "phive install --temporary",
+    "dev:init:git-hooks": "./tools/captainhook install --only-enabled --force"
+  },
+  "scripts-aliases": {
+    "test": [
+      "dev:test"
+    ]
+  },
+  "scripts-descriptions": {
+    "test": "Runs linting, static analysis, and unit tests.",
+    "dev:phpunit": "Run PHPUnit test suites",
+    "dev:lint": "Run PHPStan and code style check",
+    "dev:lint:phpstan": "Run PHPStan",
+    "dev:lint:style": "Run code style check (PHP_CodeSniffer)",
+    "dev:lint:style:fix": "Try to fix code style errors automatically",
+    "dev:init": "Initialize the developer tooling (tools and git hooks)",
+    "dev:init:check-requirements": "Check if the necessary requirements are met",
+    "dev:init:tools": "Install all developer tools (requires PHIVE)",
+    "dev:init:git-hooks": "Install all git hooks (may require tools to be installed)"
   }
 }
diff --git a/phpcs.xml.dist b/phpcs.xml.dist
new file mode 100644
index 0000000000000000000000000000000000000000..d48084fbdc86a2dbfb78dd89ab2e0b0ff2322ba7
--- /dev/null
+++ b/phpcs.xml.dist
@@ -0,0 +1,23 @@
+<?xml version="1.0"?>
+<ruleset>
+    <!-- Use PSR-12 ruleset -->
+    <rule ref="PSR12"/>
+
+    <!-- Only scan *.php files -->
+    <arg name="extensions" value="php"/>
+
+    <!-- Ignore warnings -->
+    <arg name="warning-severity" value="0"/>
+
+    <!-- Process 64 (or number of CPU cores) files in parallel -->
+    <arg name="parallel" value="64"/>
+
+    <!-- Output relative file paths, by setting the current folder as the basepath -->
+    <arg name="basepath" value="."/>
+
+    <!-- Show colored output -->
+    <arg name="colors"/>
+
+    <!-- Scan everything in the current folder -->
+    <file>.</file>
+</ruleset>
diff --git a/phpstan-baseline.neon b/phpstan-baseline.neon
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..74b2d37c7dfe87af6b0c178f3bf338249bd4d1b7 100644
--- a/phpstan-baseline.neon
+++ b/phpstan-baseline.neon
@@ -0,0 +1,46 @@
+parameters:
+	ignoreErrors:
+		-
+			message: "#^Call to an undefined method QUI\\\\CRUD\\\\Child\\:\\:isActive\\(\\)\\.$#"
+			count: 1
+			path: ajax/activate.php
+
+		-
+			message: "#^Call to an undefined method QUI\\\\CRUD\\\\Child\\:\\:isActive\\(\\)\\.$#"
+			count: 1
+			path: ajax/deactivate.php
+
+		-
+			message: "#^Call to an undefined method QUI\\\\CRUD\\\\Child\\:\\:getTitle\\(\\)\\.$#"
+			count: 1
+			path: ajax/get.php
+
+		-
+			message: "#^Parameter \\#2 \\$callback of function usort expects callable\\(mixed, mixed\\)\\: int, Closure\\(mixed, mixed\\)\\: bool given\\.$#"
+			count: 1
+			path: ajax/search.php
+
+		-
+			message: "#^Call to an undefined method QUI\\\\CRUD\\\\Child\\:\\:isActive\\(\\)\\.$#"
+			count: 2
+			path: ajax/toggle.php
+
+		-
+			message: "#^Call to method getArticles\\(\\) on an unknown class QUI\\\\ERP\\\\Order\\\\OrderInterface\\.$#"
+			count: 1
+			path: src/QUI/ERP/Discount/Discount.php
+
+		-
+			message: "#^Parameter \\#2 \\$array of function implode expects array\\|null, string given\\.$#"
+			count: 1
+			path: src/QUI/ERP/Discount/Discount.php
+
+		-
+			message: "#^Parameter \\$Order of method QUI\\\\ERP\\\\Discount\\\\Discount\\:\\:canUsedInOrder\\(\\) has invalid type QUI\\\\ERP\\\\Order\\\\OrderInterface\\.$#"
+			count: 2
+			path: src/QUI/ERP/Discount/Discount.php
+
+		-
+			message: "#^Parameter \\#2 \\$string of function explode expects string, float\\|int\\<min, \\-1\\>\\|int\\<1, max\\>\\|true given\\.$#"
+			count: 1
+			path: src/QUI/ERP/Discount/PriceFactor.php
diff --git a/phpstan.dist.neon b/phpstan.dist.neon
index a545a041a3c5b0c758d99bf8c1c49b2a83252eaa..56d8beab0e0ae895340157b07790b8ad830f8d48 100644
--- a/phpstan.dist.neon
+++ b/phpstan.dist.neon
@@ -2,9 +2,32 @@ includes:
     - phpstan-baseline.neon
 
 parameters:
-    level: 1
+    level: 5
     paths:
         - src
         - ajax
     bootstrapFiles:
-        - tests/phpstan-bootstrap.php
\ No newline at end of file
+        - tests/phpstan-bootstrap.php
+    treatPhpDocTypesAsCertain: false
+    customRulesetUsed: true
+services:
+    -
+        class: \PHPStan\Rules\Properties\TypesAssignedToPropertiesRule
+        tags:
+            - phpstan.rules.rule
+    -
+        class: \PHPStan\Rules\Functions\ArrowFunctionReturnTypeRule
+        tags:
+            - phpstan.rules.rule
+    -
+        class: \PHPStan\Rules\Functions\ClosureReturnTypeRule
+        tags:
+            - phpstan.rules.rule
+    -
+        class: \PHPStan\Rules\Functions\ReturnTypeRule
+        tags:
+            - phpstan.rules.rule
+    -
+        class: \PHPStan\Rules\Methods\ReturnTypeRule
+        tags:
+            - phpstan.rules.rule
diff --git a/phpunit.dist.xml b/phpunit.dist.xml
new file mode 100644
index 0000000000000000000000000000000000000000..f6c7becf0c12757beb871a9333e2d81e02aa7cae
--- /dev/null
+++ b/phpunit.dist.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit bootstrap="tests/phpunit-bootstrap.php">
+    <testsuites>
+        <testsuite name="Tests">
+            <directory>tests/</directory>
+        </testsuite>
+    </testsuites>
+</phpunit>
diff --git a/tests/phpunit-bootstrap.php b/tests/phpunit-bootstrap.php
new file mode 100644
index 0000000000000000000000000000000000000000..eca92fd67bed8ae4ec424ed82d300119d792f042
--- /dev/null
+++ b/tests/phpunit-bootstrap.php
@@ -0,0 +1,11 @@
+<?php
+
+if (!defined('QUIQQER_SYSTEM')) {
+    define('QUIQQER_SYSTEM', true);
+}
+
+if (!defined('QUIQQER_AJAX')) {
+    define('QUIQQER_AJAX', true);
+}
+
+require_once __DIR__ . '/../../../../bootstrap.php';