diff --git a/.env b/.env
new file mode 100644
index 0000000..7881a3c
--- /dev/null
+++ b/.env
@@ -0,0 +1,4 @@
+UID=503
+GID=20
+PHP_IDE_CONFIG=serverName=Docker
+XDEBUG_SESSION=PHPSTORM
\ No newline at end of file
diff --git a/.github/workflows/cart-sample.yml b/.github/workflows/cart-sample.yml
new file mode 100644
index 0000000..76f4b19
--- /dev/null
+++ b/.github/workflows/cart-sample.yml
@@ -0,0 +1,82 @@
+name: Cart sample PHP CI
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  phpstan:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        php: [ 8.3 ]
+
+    services:
+      docker:
+        image: docker:20.10
+        options: --privileged
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Set up PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          extensions: mbstring, xml
+
+      - name: Install dependencies
+        run: composer install
+
+      - name: Run PHPStan
+        run: vendor/bin/phpstan analyse -l max
+
+  unit-tests:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        php: [ 8.3 ]
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Set up PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          extensions: mbstring, xml
+
+      - name: Install dependencies
+        run: composer install
+
+      - name: Run Unit Tests
+        run: vendor/bin/phpunit --configuration phpunit.xml --testsuite unit
+
+  integration-tests:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        php: [ 8.3 ]
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Set up PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          extensions: mbstring, xml
+
+      - name: Install dependencies
+        run: composer install
+
+      - name: Run Integration Tests
+        run: vendor/bin/phpunit --configuration phpunit.xml --testsuite integration
+
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..8d5ed44
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+.phpunit.cache
+vendor
+.idea
\ No newline at end of file
diff --git a/README.md b/README.md
index 78cc0f5..cb74243 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,23 @@
-# cart-sample
\ No newline at end of file
+# Sample cart project
+
+## requirements
+
+- docker
+- docker-compose
+
+## instalation
+
+1. `docker-compose up -d`
+2. inside container `composer install`
+
+## run tests:
+
+- unit / integration:
+    - inside container: `composer test`
+- static tests (phpstan)
+    - inside container: `composer analyse`
+
+## assumptions:
+
+- json file is used as products database
+-
\ No newline at end of file
diff --git a/composer.json b/composer.json
new file mode 100644
index 0000000..ef0c51e
--- /dev/null
+++ b/composer.json
@@ -0,0 +1,28 @@
+{
+  "name": "sample/cart",
+  "description": "Challenge project",
+  "type": "project",
+  "require": {
+    "php": "^8.3"
+  },
+  "require-dev": {
+    "phpunit/phpunit": "^11.0",
+    "phpstan/phpstan": "^1.0"
+  },
+  "autoload": {
+    "psr-4": {
+      "App\\": "src/"
+    }
+  },
+  "autoload-dev": {
+    "psr-4": {
+      "App\\Tests\\": "tests/"
+    }
+  },
+  "scripts": {
+    "test": "phpunit --configuration phpunit.xml",
+    "analyse": "phpstan analyse"
+  },
+  "minimum-stability": "stable",
+  "prefer-stable": true
+}
diff --git a/composer.lock b/composer.lock
new file mode 100644
index 0000000..4a9ee3e
--- /dev/null
+++ b/composer.lock
@@ -0,0 +1,1711 @@
+{
+    "_readme": [
+        "This file locks the dependencies of your project to a known state",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
+        "This file is @generated automatically"
+    ],
+    "content-hash": "9e388664069cec228b3c7eb525c275dd",
+    "packages": [],
+    "packages-dev": [
+        {
+            "name": "myclabs/deep-copy",
+            "version": "1.12.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/myclabs/DeepCopy.git",
+                "reference": "3a6b9a42cd8f8771bd4295d13e1423fa7f3d942c"
+            },
+            "dist": {
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+                "reference": "3a6b9a42cd8f8771bd4295d13e1423fa7f3d942c",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.1 || ^8.0"
+            },
+            "conflict": {
+                "doctrine/collections": "<1.6.8",
+                "doctrine/common": "<2.13.3 || >=3 <3.2.2"
+            },
+            "require-dev": {
+                "doctrine/collections": "^1.6.8",
+                "doctrine/common": "^2.13.3 || ^3.2.2",
+                "phpspec/prophecy": "^1.10",
+                "phpunit/phpunit": "^7.5.20 || ^8.5.23 || ^9.5.13"
+            },
+            "type": "library",
+            "autoload": {
+                "files": [
+                    "src/DeepCopy/deep_copy.php"
+                ],
+                "psr-4": {
+                    "DeepCopy\\": "src/DeepCopy/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "Create deep copies (clones) of your objects",
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+                "clone",
+                "copy",
+                "duplicate",
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+            },
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+                }
+            ],
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+                }
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+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
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+                }
+            ],
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+            "keywords": [
+                "parser",
+                "php"
+            ],
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+            },
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+            },
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+                    "role": "Developer"
+                },
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+                "reference": "c414673eee9a8f9d51bbf8d61fc9e3ef1e85b20e",
+                "shasum": ""
+            },
+            "require": {
+                "ext-mbstring": "*",
+                "php": ">=8.2",
+                "sebastian/recursion-context": "^6.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^11.2"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "6.1-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                },
+                {
+                    "name": "Jeff Welch",
+                    "email": "whatthejeff@gmail.com"
+                },
+                {
+                    "name": "Volker Dusch",
+                    "email": "github@wallbash.com"
+                },
+                {
+                    "name": "Adam Harvey",
+                    "email": "aharvey@php.net"
+                },
+                {
+                    "name": "Bernhard Schussek",
+                    "email": "bschussek@gmail.com"
+                }
+            ],
+            "description": "Provides the functionality to export PHP variables for visualization",
+            "homepage": "https://www.github.com/sebastianbergmann/exporter",
+            "keywords": [
+                "export",
+                "exporter"
+            ],
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/exporter/issues",
+                "security": "https://github.com/sebastianbergmann/exporter/security/policy",
+                "source": "https://github.com/sebastianbergmann/exporter/tree/6.1.3"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-07-03T04:56:19+00:00"
+        },
+        {
+            "name": "sebastian/global-state",
+            "version": "7.0.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/global-state.git",
+                "reference": "3be331570a721f9a4b5917f4209773de17f747d7"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/global-state/zipball/3be331570a721f9a4b5917f4209773de17f747d7",
+                "reference": "3be331570a721f9a4b5917f4209773de17f747d7",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.2",
+                "sebastian/object-reflector": "^4.0",
+                "sebastian/recursion-context": "^6.0"
+            },
+            "require-dev": {
+                "ext-dom": "*",
+                "phpunit/phpunit": "^11.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "7.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Snapshotting of global state",
+            "homepage": "https://www.github.com/sebastianbergmann/global-state",
+            "keywords": [
+                "global state"
+            ],
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/global-state/issues",
+                "security": "https://github.com/sebastianbergmann/global-state/security/policy",
+                "source": "https://github.com/sebastianbergmann/global-state/tree/7.0.2"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-07-03T04:57:36+00:00"
+        },
+        {
+            "name": "sebastian/lines-of-code",
+            "version": "3.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/lines-of-code.git",
+                "reference": "d36ad0d782e5756913e42ad87cb2890f4ffe467a"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/lines-of-code/zipball/d36ad0d782e5756913e42ad87cb2890f4ffe467a",
+                "reference": "d36ad0d782e5756913e42ad87cb2890f4ffe467a",
+                "shasum": ""
+            },
+            "require": {
+                "nikic/php-parser": "^5.0",
+                "php": ">=8.2"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^11.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "3.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Library for counting the lines of code in PHP source code",
+            "homepage": "https://github.com/sebastianbergmann/lines-of-code",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/lines-of-code/issues",
+                "security": "https://github.com/sebastianbergmann/lines-of-code/security/policy",
+                "source": "https://github.com/sebastianbergmann/lines-of-code/tree/3.0.1"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-07-03T04:58:38+00:00"
+        },
+        {
+            "name": "sebastian/object-enumerator",
+            "version": "6.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/object-enumerator.git",
+                "reference": "f5b498e631a74204185071eb41f33f38d64608aa"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/object-enumerator/zipball/f5b498e631a74204185071eb41f33f38d64608aa",
+                "reference": "f5b498e631a74204185071eb41f33f38d64608aa",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.2",
+                "sebastian/object-reflector": "^4.0",
+                "sebastian/recursion-context": "^6.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^11.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "6.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Traverses array structures and object graphs to enumerate all referenced objects",
+            "homepage": "https://github.com/sebastianbergmann/object-enumerator/",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/object-enumerator/issues",
+                "security": "https://github.com/sebastianbergmann/object-enumerator/security/policy",
+                "source": "https://github.com/sebastianbergmann/object-enumerator/tree/6.0.1"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-07-03T05:00:13+00:00"
+        },
+        {
+            "name": "sebastian/object-reflector",
+            "version": "4.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/object-reflector.git",
+                "reference": "6e1a43b411b2ad34146dee7524cb13a068bb35f9"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/object-reflector/zipball/6e1a43b411b2ad34146dee7524cb13a068bb35f9",
+                "reference": "6e1a43b411b2ad34146dee7524cb13a068bb35f9",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.2"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^11.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "4.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Allows reflection of object attributes, including inherited and non-public ones",
+            "homepage": "https://github.com/sebastianbergmann/object-reflector/",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/object-reflector/issues",
+                "security": "https://github.com/sebastianbergmann/object-reflector/security/policy",
+                "source": "https://github.com/sebastianbergmann/object-reflector/tree/4.0.1"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-07-03T05:01:32+00:00"
+        },
+        {
+            "name": "sebastian/recursion-context",
+            "version": "6.0.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/recursion-context.git",
+                "reference": "694d156164372abbd149a4b85ccda2e4670c0e16"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/recursion-context/zipball/694d156164372abbd149a4b85ccda2e4670c0e16",
+                "reference": "694d156164372abbd149a4b85ccda2e4670c0e16",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.2"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^11.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "6.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                },
+                {
+                    "name": "Jeff Welch",
+                    "email": "whatthejeff@gmail.com"
+                },
+                {
+                    "name": "Adam Harvey",
+                    "email": "aharvey@php.net"
+                }
+            ],
+            "description": "Provides functionality to recursively process PHP variables",
+            "homepage": "https://github.com/sebastianbergmann/recursion-context",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/recursion-context/issues",
+                "security": "https://github.com/sebastianbergmann/recursion-context/security/policy",
+                "source": "https://github.com/sebastianbergmann/recursion-context/tree/6.0.2"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-07-03T05:10:34+00:00"
+        },
+        {
+            "name": "sebastian/type",
+            "version": "5.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/type.git",
+                "reference": "fb6a6566f9589e86661291d13eba708cce5eb4aa"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/type/zipball/fb6a6566f9589e86661291d13eba708cce5eb4aa",
+                "reference": "fb6a6566f9589e86661291d13eba708cce5eb4aa",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.2"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^11.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "5.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Collection of value objects that represent the types of the PHP type system",
+            "homepage": "https://github.com/sebastianbergmann/type",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/type/issues",
+                "security": "https://github.com/sebastianbergmann/type/security/policy",
+                "source": "https://github.com/sebastianbergmann/type/tree/5.0.1"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-07-03T05:11:49+00:00"
+        },
+        {
+            "name": "sebastian/version",
+            "version": "5.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/version.git",
+                "reference": "45c9debb7d039ce9b97de2f749c2cf5832a06ac4"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/version/zipball/45c9debb7d039ce9b97de2f749c2cf5832a06ac4",
+                "reference": "45c9debb7d039ce9b97de2f749c2cf5832a06ac4",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.2"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "5.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Library that helps with managing the version number of Git-hosted PHP projects",
+            "homepage": "https://github.com/sebastianbergmann/version",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/version/issues",
+                "security": "https://github.com/sebastianbergmann/version/security/policy",
+                "source": "https://github.com/sebastianbergmann/version/tree/5.0.1"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-07-03T05:13:08+00:00"
+        },
+        {
+            "name": "theseer/tokenizer",
+            "version": "1.2.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/theseer/tokenizer.git",
+                "reference": "737eda637ed5e28c3413cb1ebe8bb52cbf1ca7a2"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/theseer/tokenizer/zipball/737eda637ed5e28c3413cb1ebe8bb52cbf1ca7a2",
+                "reference": "737eda637ed5e28c3413cb1ebe8bb52cbf1ca7a2",
+                "shasum": ""
+            },
+            "require": {
+                "ext-dom": "*",
+                "ext-tokenizer": "*",
+                "ext-xmlwriter": "*",
+                "php": "^7.2 || ^8.0"
+            },
+            "type": "library",
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Arne Blankerts",
+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "A small library for converting tokenized PHP source code into XML and potentially other formats",
+            "support": {
+                "issues": "https://github.com/theseer/tokenizer/issues",
+                "source": "https://github.com/theseer/tokenizer/tree/1.2.3"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/theseer",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-03-03T12:36:25+00:00"
+        }
+    ],
+    "aliases": [],
+    "minimum-stability": "stable",
+    "stability-flags": [],
+    "prefer-stable": true,
+    "prefer-lowest": false,
+    "platform": {
+        "php": "^8.3"
+    },
+    "platform-dev": [],
+    "plugin-api-version": "2.6.0"
+}
diff --git a/docker-compose.yml b/docker-compose.yml
new file mode 100644
index 0000000..5fb2786
--- /dev/null
+++ b/docker-compose.yml
@@ -0,0 +1,24 @@
+version: '3.8'
+
+services:
+  php:
+    build:
+      context: ./docker/php
+    container_name: php_sample_cart
+    volumes:
+      - ./:/var/www
+      - ./docker/php/conf.d:/usr/local/etc/php/conf.d
+    ports:
+      - "9001:9000"
+      - "9003:9003"  # Expose the Xdebug port
+    environment:
+      XDEBUG_SESSION: PHPSTORM
+      XDEBUG_LOG: /tmp/xdebug.log
+      XDEBUG_CLIENT_HOST: host.docker.internal
+      XDEBUG_CLIENT_PORT: 9003
+    networks:
+      - sample_cart_network
+
+networks:
+  sample_cart_network:
+    driver: bridge
diff --git a/docker/php/Dockerfile b/docker/php/Dockerfile
new file mode 100644
index 0000000..14485d8
--- /dev/null
+++ b/docker/php/Dockerfile
@@ -0,0 +1,34 @@
+FROM php:8.3-fpm
+
+RUN apt-get update && \
+    apt-get install -y \
+        libzip-dev \
+        unzip \
+        git \
+        libicu-dev \
+        libxml2-dev && \
+    docker-php-ext-configure intl && \
+    docker-php-ext-install intl zip && \
+    docker-php-ext-enable intl zip
+
+# Install Xdebug
+RUN pecl install xdebug && \
+    docker-php-ext-enable xdebug
+
+# Install Composer
+RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer
+
+# Copy configuration files
+COPY conf.d/xdebug.ini /usr/local/etc/php/conf.d/xdebug.ini
+
+# Set the working directory
+WORKDIR /var/www
+
+# Set proper permissions (adjust as necessary)
+RUN chown -R www-data:www-data /var/www
+
+# Expose the port on which PHP-FPM will listen
+EXPOSE 9000
+
+# Start PHP-FPM server
+CMD ["php-fpm"]
diff --git a/docker/php/conf.d/xdebug.ini b/docker/php/conf.d/xdebug.ini
new file mode 100644
index 0000000..83ebccc
--- /dev/null
+++ b/docker/php/conf.d/xdebug.ini
@@ -0,0 +1,8 @@
+zend_extension=xdebug
+
+xdebug.mode=debug
+xdebug.start_with_request=yes
+xdebug.client_host=host.docker.internal
+xdebug.client_port=9003
+xdebug.log=/tmp/xdebug.log
+xdebug.discover_client_host=true
diff --git a/phpstan.neon b/phpstan.neon
new file mode 100644
index 0000000..28dc7f0
--- /dev/null
+++ b/phpstan.neon
@@ -0,0 +1,11 @@
+parameters:
+    phpVersion: 80309
+
+    level: max
+
+    paths:
+        - src
+        - tests
+
+    parallel:
+          maximumNumberOfProcesses: 5
diff --git a/phpunit.xml b/phpunit.xml
new file mode 100644
index 0000000..7493d7e
--- /dev/null
+++ b/phpunit.xml
@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         displayDetailsOnTestsThatTriggerWarnings="true"
+         bootstrap="vendor/autoload.php"
+         colors="true"
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/11.2/phpunit.xsd"
+         cacheDirectory=".phpunit.cache">
+  <testsuites>
+    <testsuite name="Unit Tests">
+      <directory>tests/Unit</directory>
+    </testsuite>
+    <testsuite name="Integration Tests">
+      <directory>tests/Integration</directory>
+    </testsuite>
+  </testsuites>
+  <source>
+    <include>
+      <directory>src</directory>
+    </include>
+  </source>
+</phpunit>