diff --git a/.gitea/workflows/test.yml b/.gitea/workflows/test.yml
new file mode 100644
index 0000000..0549f90
--- /dev/null
+++ b/.gitea/workflows/test.yml
@@ -0,0 +1,46 @@
+name: Tests
+
+on:
+  push:
+    branches: [ main, master, develop ]
+  pull_request:
+    branches: [ main, master, develop ]
+
+jobs:
+  lint:
+    name: PHP Lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Check PHP syntax
+        run: |
+          find . -name "*.php" ! -path "./vendor/*" ! -path "./tests/*" -print0 | xargs -0 -n1 php -l
+          echo "PHP syntax OK"
+
+  unit:
+    name: Unit Tests
+    runs-on: ubuntu-latest
+    # The suite boots off the core plugin's test bootstrap, so the core must be
+    # checked out next to this AddOn under wp-content/plugins/.
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          path: 2meet-data-optimizer-woocommerce-addon
+
+      - name: Checkout core plugin
+        uses: actions/checkout@v4
+        with:
+          repository: wpdev/2meet-data-optimizer
+          path: 2meet-data-optimizer
+
+      - name: Install dependencies
+        working-directory: 2meet-data-optimizer-woocommerce-addon
+        run: composer install --no-interaction --prefer-dist
+
+      - name: Install core dev dependencies (test bootstrap needs them)
+        working-directory: 2meet-data-optimizer
+        run: composer install --no-interaction --prefer-dist
+
+      - name: Run unit tests
+        working-directory: 2meet-data-optimizer-woocommerce-addon
+        run: php vendor/bin/phpunit --configuration phpunit.xml --testdox
diff --git a/.gitignore b/.gitignore
index 4ac74fc..69f1995 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,3 +14,5 @@ Thumbs.db
 .playwright-mcp/
 .claude/
 dist/
+.phpunit.cache
+.phpunit.result.cache
diff --git a/composer.json b/composer.json
index 2b99483..86d4ce7 100644
--- a/composer.json
+++ b/composer.json
@@ -1,18 +1,24 @@
 {
     "name": "2meet/2meet-data-optimizer-woocommerce-addon",
-    "description": "WooCommerce 整合：20 表 schema 註冊 + commission tracking + product/order zone + HPOS notice",
+    "description": "WooCommerce integration layer for 2meet Data Optimizer",
     "type": "wordpress-plugin",
     "license": "GPL-2.0-or-later",
-    "keywords": ["wordpress", "2meet-data-optimizer", "addon", "woocommerce"],
     "require": {
         "php": ">=8.1"
     },
     "require-dev": {
+        "brain/monkey": "^2.6",
+        "dealerdirect/phpcodesniffer-composer-installer": "^1.2",
+        "phpcompatibility/phpcompatibility-wp": "^2.1",
+        "phpcsstandards/phpcsutils": "^1.2",
         "phpunit/phpunit": "^10.5",
-        "wp-coding-standards/wpcs": "^3.0"
+        "squizlabs/php_codesniffer": "^3.13",
+        "wp-coding-standards/wpcs": "^3.0",
+        "yoast/phpunit-polyfills": "^2.0"
     },
     "scripts": {
-        "phpcs": "phpcs --standard=WordPress includes/ 2meet-data-optimizer-woocommerce-addon.php"
+        "test": "phpunit --configuration phpunit.xml",
+        "phpcs": "phpcs --standard=WordPress includes/ admin/ cli/"
     },
     "config": {
         "allow-plugins": {
diff --git a/composer.lock b/composer.lock
index 05915be..cdd2051 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,9 +4,127 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "cba6cd51d0a978057a719f3b0cf1a78d",
+    "content-hash": "6e6e5104586cd2b1a09c1e5c74ad35f9",
     "packages": [],
     "packages-dev": [
+        {
+            "name": "antecedent/patchwork",
+            "version": "2.2.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/antecedent/patchwork.git",
+                "reference": "8b6b235f405af175259c8f56aea5fc23ab9f03ce"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/antecedent/patchwork/zipball/8b6b235f405af175259c8f56aea5fc23ab9f03ce",
+                "reference": "8b6b235f405af175259c8f56aea5fc23ab9f03ce",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.1.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": ">=4"
+            },
+            "type": "library",
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Ignas Rudaitis",
+                    "email": "ignas.rudaitis@gmail.com"
+                }
+            ],
+            "description": "Method redefinition (monkey-patching) functionality for PHP.",
+            "homepage": "https://antecedent.github.io/patchwork/",
+            "keywords": [
+                "aop",
+                "aspect",
+                "interception",
+                "monkeypatching",
+                "redefinition",
+                "runkit",
+                "testing"
+            ],
+            "support": {
+                "issues": "https://github.com/antecedent/patchwork/issues",
+                "source": "https://github.com/antecedent/patchwork/tree/2.2.3"
+            },
+            "time": "2025-09-17T09:00:56+00:00"
+        },
+        {
+            "name": "brain/monkey",
+            "version": "2.7.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/Brain-WP/BrainMonkey.git",
+                "reference": "ea3aeb3d559ba3c0930b3f4d210b665a4c044d83"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/Brain-WP/BrainMonkey/zipball/ea3aeb3d559ba3c0930b3f4d210b665a4c044d83",
+                "reference": "ea3aeb3d559ba3c0930b3f4d210b665a4c044d83",
+                "shasum": ""
+            },
+            "require": {
+                "antecedent/patchwork": "^2.1.17",
+                "mockery/mockery": "~1.3.6 || ~1.4.4 || ~1.5.1 || ^1.6.10",
+                "php": ">=5.6.0"
+            },
+            "require-dev": {
+                "dealerdirect/phpcodesniffer-composer-installer": "^1.0.0",
+                "phpcompatibility/php-compatibility": "^9.3.0",
+                "phpunit/phpunit": "^5.7.27 || ^6.5.14 || ^7.5.20 || ^8.5.49 || ^9.6.30"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.x-dev",
+                    "dev-version/1": "1.x-dev"
+                }
+            },
+            "autoload": {
+                "files": [
+                    "inc/api.php"
+                ],
+                "psr-4": {
+                    "Brain\\Monkey\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Giuseppe Mazzapica",
+                    "email": "giuseppe.mazzapica@gmail.com",
+                    "homepage": "https://gmazzap.me",
+                    "role": "Developer"
+                }
+            ],
+            "description": "Mocking utility for PHP functions and WordPress plugin API",
+            "keywords": [
+                "Monkey Patching",
+                "interception",
+                "mock",
+                "mock functions",
+                "mockery",
+                "patchwork",
+                "redefinition",
+                "runkit",
+                "test",
+                "testing"
+            ],
+            "support": {
+                "issues": "https://github.com/Brain-WP/BrainMonkey/issues",
+                "source": "https://github.com/Brain-WP/BrainMonkey"
+            },
+            "time": "2026-02-05T09:22:14+00:00"
+        },
         {
             "name": "dealerdirect/phpcodesniffer-composer-installer",
             "version": "v1.2.1",
@@ -103,6 +221,140 @@
             ],
             "time": "2026-05-06T08:26:05+00:00"
         },
+        {
+            "name": "hamcrest/hamcrest-php",
+            "version": "v2.1.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/hamcrest/hamcrest-php.git",
+                "reference": "f8b1c0173b22fa6ec77a81fe63e5b01eba7e6487"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/hamcrest/hamcrest-php/zipball/f8b1c0173b22fa6ec77a81fe63e5b01eba7e6487",
+                "reference": "f8b1c0173b22fa6ec77a81fe63e5b01eba7e6487",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.4|^8.0"
+            },
+            "replace": {
+                "cordoval/hamcrest-php": "*",
+                "davedevelopment/hamcrest-php": "*",
+                "kodova/hamcrest-php": "*"
+            },
+            "require-dev": {
+                "phpunit/php-file-iterator": "^1.4 || ^2.0 || ^3.0",
+                "phpunit/phpunit": "^4.8.36 || ^5.7 || ^6.5 || ^7.0 || ^8.0 || ^9.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.1-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "hamcrest"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "description": "This is the PHP port of Hamcrest Matchers",
+            "keywords": [
+                "test"
+            ],
+            "support": {
+                "issues": "https://github.com/hamcrest/hamcrest-php/issues",
+                "source": "https://github.com/hamcrest/hamcrest-php/tree/v2.1.1"
+            },
+            "time": "2025-04-30T06:54:44+00:00"
+        },
+        {
+            "name": "mockery/mockery",
+            "version": "1.6.12",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/mockery/mockery.git",
+                "reference": "1f4efdd7d3beafe9807b08156dfcb176d18f1699"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/mockery/mockery/zipball/1f4efdd7d3beafe9807b08156dfcb176d18f1699",
+                "reference": "1f4efdd7d3beafe9807b08156dfcb176d18f1699",
+                "shasum": ""
+            },
+            "require": {
+                "hamcrest/hamcrest-php": "^2.0.1",
+                "lib-pcre": ">=7.0",
+                "php": ">=7.3"
+            },
+            "conflict": {
+                "phpunit/phpunit": "<8.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^8.5 || ^9.6.17",
+                "symplify/easy-coding-standard": "^12.1.14"
+            },
+            "type": "library",
+            "autoload": {
+                "files": [
+                    "library/helpers.php",
+                    "library/Mockery.php"
+                ],
+                "psr-4": {
+                    "Mockery\\": "library/Mockery"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Pádraic Brady",
+                    "email": "padraic.brady@gmail.com",
+                    "homepage": "https://github.com/padraic",
+                    "role": "Author"
+                },
+                {
+                    "name": "Dave Marshall",
+                    "email": "dave.marshall@atstsolutions.co.uk",
+                    "homepage": "https://davedevelopment.co.uk",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Nathanael Esayeas",
+                    "email": "nathanael.esayeas@protonmail.com",
+                    "homepage": "https://github.com/ghostwriter",
+                    "role": "Lead Developer"
+                }
+            ],
+            "description": "Mockery is a simple yet flexible PHP mock object framework",
+            "homepage": "https://github.com/mockery/mockery",
+            "keywords": [
+                "BDD",
+                "TDD",
+                "library",
+                "mock",
+                "mock objects",
+                "mockery",
+                "stub",
+                "test",
+                "test double",
+                "testing"
+            ],
+            "support": {
+                "docs": "https://docs.mockery.io/",
+                "issues": "https://github.com/mockery/mockery/issues",
+                "rss": "https://github.com/mockery/mockery/releases.atom",
+                "security": "https://github.com/mockery/mockery/security/advisories",
+                "source": "https://github.com/mockery/mockery"
+            },
+            "time": "2024-05-16T03:13:13+00:00"
+        },
         {
             "name": "myclabs/deep-copy",
             "version": "1.13.4",
@@ -165,20 +417,19 @@
         },
         {
             "name": "nikic/php-parser",
-            "version": "v5.7.0",
+            "version": "v5.8.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/nikic/PHP-Parser.git",
-                "reference": "dca41cd15c2ac9d055ad70dbfd011130757d1f82"
+                "reference": "044a6a392ff8ad0d61f14370a5fbbd0a0107152f"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/nikic/PHP-Parser/zipball/dca41cd15c2ac9d055ad70dbfd011130757d1f82",
-                "reference": "dca41cd15c2ac9d055ad70dbfd011130757d1f82",
+                "url": "https://api.github.com/repos/nikic/PHP-Parser/zipball/044a6a392ff8ad0d61f14370a5fbbd0a0107152f",
+                "reference": "044a6a392ff8ad0d61f14370a5fbbd0a0107152f",
                 "shasum": ""
             },
             "require": {
-                "ext-ctype": "*",
                 "ext-json": "*",
                 "ext-tokenizer": "*",
                 "php": ">=7.4"
@@ -217,9 +468,9 @@
             ],
             "support": {
                 "issues": "https://github.com/nikic/PHP-Parser/issues",
-                "source": "https://github.com/nikic/PHP-Parser/tree/v5.7.0"
+                "source": "https://github.com/nikic/PHP-Parser/tree/v5.8.0"
             },
-            "time": "2025-12-06T11:56:16+00:00"
+            "time": "2026-07-04T14:30:18+00:00"
         },
         {
             "name": "phar-io/manifest",
@@ -340,22 +591,235 @@
             "time": "2022-02-21T01:04:05+00:00"
         },
         {
-            "name": "phpcsstandards/phpcsextra",
-            "version": "1.5.0",
+            "name": "phpcompatibility/php-compatibility",
+            "version": "9.3.5",
             "source": {
                 "type": "git",
-                "url": "https://github.com/PHPCSStandards/PHPCSExtra.git",
-                "reference": "b598aa890815b8df16363271b659d73280129101"
+                "url": "https://github.com/PHPCompatibility/PHPCompatibility.git",
+                "reference": "9fb324479acf6f39452e0655d2429cc0d3914243"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/PHPCSStandards/PHPCSExtra/zipball/b598aa890815b8df16363271b659d73280129101",
-                "reference": "b598aa890815b8df16363271b659d73280129101",
+                "url": "https://api.github.com/repos/PHPCompatibility/PHPCompatibility/zipball/9fb324479acf6f39452e0655d2429cc0d3914243",
+                "reference": "9fb324479acf6f39452e0655d2429cc0d3914243",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3",
+                "squizlabs/php_codesniffer": "^2.3 || ^3.0.2"
+            },
+            "conflict": {
+                "squizlabs/php_codesniffer": "2.6.2"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "~4.5 || ^5.0 || ^6.0 || ^7.0"
+            },
+            "suggest": {
+                "dealerdirect/phpcodesniffer-composer-installer": "^0.5 || This Composer plugin will sort out the PHPCS 'installed_paths' automatically.",
+                "roave/security-advisories": "dev-master || Helps prevent installing dependencies with known security issues."
+            },
+            "type": "phpcodesniffer-standard",
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "LGPL-3.0-or-later"
+            ],
+            "authors": [
+                {
+                    "name": "Wim Godden",
+                    "homepage": "https://github.com/wimg",
+                    "role": "lead"
+                },
+                {
+                    "name": "Juliette Reinders Folmer",
+                    "homepage": "https://github.com/jrfnl",
+                    "role": "lead"
+                },
+                {
+                    "name": "Contributors",
+                    "homepage": "https://github.com/PHPCompatibility/PHPCompatibility/graphs/contributors"
+                }
+            ],
+            "description": "A set of sniffs for PHP_CodeSniffer that checks for PHP cross-version compatibility.",
+            "homepage": "http://techblog.wimgodden.be/tag/codesniffer/",
+            "keywords": [
+                "compatibility",
+                "phpcs",
+                "standards"
+            ],
+            "support": {
+                "issues": "https://github.com/PHPCompatibility/PHPCompatibility/issues",
+                "source": "https://github.com/PHPCompatibility/PHPCompatibility"
+            },
+            "time": "2019-12-27T09:44:58+00:00"
+        },
+        {
+            "name": "phpcompatibility/phpcompatibility-paragonie",
+            "version": "1.3.4",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/PHPCompatibility/PHPCompatibilityParagonie.git",
+                "reference": "244d7b04fc4bc2117c15f5abe23eb933b5f02bbf"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/PHPCompatibility/PHPCompatibilityParagonie/zipball/244d7b04fc4bc2117c15f5abe23eb933b5f02bbf",
+                "reference": "244d7b04fc4bc2117c15f5abe23eb933b5f02bbf",
+                "shasum": ""
+            },
+            "require": {
+                "phpcompatibility/php-compatibility": "^9.0"
+            },
+            "require-dev": {
+                "dealerdirect/phpcodesniffer-composer-installer": "^1.0",
+                "paragonie/random_compat": "dev-master",
+                "paragonie/sodium_compat": "dev-master"
+            },
+            "suggest": {
+                "dealerdirect/phpcodesniffer-composer-installer": "^1.0 || This Composer plugin will sort out the PHP_CodeSniffer 'installed_paths' automatically.",
+                "roave/security-advisories": "dev-master || Helps prevent installing dependencies with known security issues."
+            },
+            "type": "phpcodesniffer-standard",
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "LGPL-3.0-or-later"
+            ],
+            "authors": [
+                {
+                    "name": "Wim Godden",
+                    "role": "lead"
+                },
+                {
+                    "name": "Juliette Reinders Folmer",
+                    "role": "lead"
+                }
+            ],
+            "description": "A set of rulesets for PHP_CodeSniffer to check for PHP cross-version compatibility issues in projects, while accounting for polyfills provided by the Paragonie polyfill libraries.",
+            "homepage": "http://phpcompatibility.com/",
+            "keywords": [
+                "compatibility",
+                "paragonie",
+                "phpcs",
+                "polyfill",
+                "standards",
+                "static analysis"
+            ],
+            "support": {
+                "issues": "https://github.com/PHPCompatibility/PHPCompatibilityParagonie/issues",
+                "security": "https://github.com/PHPCompatibility/PHPCompatibilityParagonie/security/policy",
+                "source": "https://github.com/PHPCompatibility/PHPCompatibilityParagonie"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/PHPCompatibility",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/jrfnl",
+                    "type": "github"
+                },
+                {
+                    "url": "https://opencollective.com/php_codesniffer",
+                    "type": "open_collective"
+                },
+                {
+                    "url": "https://thanks.dev/u/gh/phpcompatibility",
+                    "type": "thanks_dev"
+                }
+            ],
+            "time": "2025-09-19T17:43:28+00:00"
+        },
+        {
+            "name": "phpcompatibility/phpcompatibility-wp",
+            "version": "2.1.8",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/PHPCompatibility/PHPCompatibilityWP.git",
+                "reference": "7c8d18b4d90dac9e86b0869a608fa09158e168fa"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/PHPCompatibility/PHPCompatibilityWP/zipball/7c8d18b4d90dac9e86b0869a608fa09158e168fa",
+                "reference": "7c8d18b4d90dac9e86b0869a608fa09158e168fa",
+                "shasum": ""
+            },
+            "require": {
+                "phpcompatibility/php-compatibility": "^9.0",
+                "phpcompatibility/phpcompatibility-paragonie": "^1.0",
+                "squizlabs/php_codesniffer": "^3.3"
+            },
+            "require-dev": {
+                "dealerdirect/phpcodesniffer-composer-installer": "^1.0"
+            },
+            "suggest": {
+                "dealerdirect/phpcodesniffer-composer-installer": "^1.0 || This Composer plugin will sort out the PHP_CodeSniffer 'installed_paths' automatically.",
+                "roave/security-advisories": "dev-master || Helps prevent installing dependencies with known security issues."
+            },
+            "type": "phpcodesniffer-standard",
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "LGPL-3.0-or-later"
+            ],
+            "authors": [
+                {
+                    "name": "Wim Godden",
+                    "role": "lead"
+                },
+                {
+                    "name": "Juliette Reinders Folmer",
+                    "role": "lead"
+                }
+            ],
+            "description": "A ruleset for PHP_CodeSniffer to check for PHP cross-version compatibility issues in projects, while accounting for polyfills provided by WordPress.",
+            "homepage": "http://phpcompatibility.com/",
+            "keywords": [
+                "compatibility",
+                "phpcs",
+                "standards",
+                "static analysis",
+                "wordpress"
+            ],
+            "support": {
+                "issues": "https://github.com/PHPCompatibility/PHPCompatibilityWP/issues",
+                "security": "https://github.com/PHPCompatibility/PHPCompatibilityWP/security/policy",
+                "source": "https://github.com/PHPCompatibility/PHPCompatibilityWP"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/PHPCompatibility",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/jrfnl",
+                    "type": "github"
+                },
+                {
+                    "url": "https://opencollective.com/php_codesniffer",
+                    "type": "open_collective"
+                },
+                {
+                    "url": "https://thanks.dev/u/gh/phpcompatibility",
+                    "type": "thanks_dev"
+                }
+            ],
+            "time": "2025-10-18T00:05:59+00:00"
+        },
+        {
+            "name": "phpcsstandards/phpcsextra",
+            "version": "1.5.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/PHPCSStandards/PHPCSExtra.git",
+                "reference": "39467533fdb742446d68c1d10ac33d625ee0311c"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/PHPCSStandards/PHPCSExtra/zipball/39467533fdb742446d68c1d10ac33d625ee0311c",
+                "reference": "39467533fdb742446d68c1d10ac33d625ee0311c",
                 "shasum": ""
             },
             "require": {
                 "php": ">=5.4",
-                "phpcsstandards/phpcsutils": "^1.2.0",
+                "phpcsstandards/phpcsutils": "^1.2.3",
                 "squizlabs/php_codesniffer": "^3.13.5 || ^4.0.1"
             },
             "require-dev": {
@@ -419,20 +883,20 @@
                     "type": "thanks_dev"
                 }
             ],
-            "time": "2025-11-12T23:06:57+00:00"
+            "time": "2026-07-27T11:13:17+00:00"
         },
         {
             "name": "phpcsstandards/phpcsutils",
-            "version": "1.2.2",
+            "version": "1.2.3",
             "source": {
                 "type": "git",
                 "url": "https://github.com/PHPCSStandards/PHPCSUtils.git",
-                "reference": "c216317e96c8b3f5932808f9b0f1f7a14e3bbf55"
+                "reference": "5f35d9408c54d7b529501f3c688b6eae562aea1f"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/PHPCSStandards/PHPCSUtils/zipball/c216317e96c8b3f5932808f9b0f1f7a14e3bbf55",
-                "reference": "c216317e96c8b3f5932808f9b0f1f7a14e3bbf55",
+                "url": "https://api.github.com/repos/PHPCSStandards/PHPCSUtils/zipball/5f35d9408c54d7b529501f3c688b6eae562aea1f",
+                "reference": "5f35d9408c54d7b529501f3c688b6eae562aea1f",
                 "shasum": ""
             },
             "require": {
@@ -512,7 +976,7 @@
                     "type": "thanks_dev"
                 }
             ],
-            "time": "2025-12-08T14:27:58+00:00"
+            "time": "2026-07-27T10:28:41+00:00"
         },
         {
             "name": "phpunit/php-code-coverage",
@@ -837,24 +1301,24 @@
         },
         {
             "name": "phpunit/phpunit",
-            "version": "10.5.63",
+            "version": "10.5.64",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/phpunit.git",
-                "reference": "33198268dad71e926626b618f3ec3966661e4d90"
+                "reference": "0e8c1d19cea35ad97d4887f363d07c78e30fbf06"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/33198268dad71e926626b618f3ec3966661e4d90",
-                "reference": "33198268dad71e926626b618f3ec3966661e4d90",
+                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/0e8c1d19cea35ad97d4887f363d07c78e30fbf06",
+                "reference": "0e8c1d19cea35ad97d4887f363d07c78e30fbf06",
                 "shasum": ""
             },
             "require": {
                 "ext-dom": "*",
+                "ext-filter": "*",
                 "ext-json": "*",
                 "ext-libxml": "*",
                 "ext-mbstring": "*",
-                "ext-xml": "*",
                 "ext-xmlwriter": "*",
                 "myclabs/deep-copy": "^1.13.4",
                 "phar-io/manifest": "^2.0.4",
@@ -918,31 +1382,15 @@
             "support": {
                 "issues": "https://github.com/sebastianbergmann/phpunit/issues",
                 "security": "https://github.com/sebastianbergmann/phpunit/security/policy",
-                "source": "https://github.com/sebastianbergmann/phpunit/tree/10.5.63"
+                "source": "https://github.com/sebastianbergmann/phpunit/tree/10.5.64"
             },
             "funding": [
                 {
-                    "url": "https://phpunit.de/sponsors.html",
-                    "type": "custom"
-                },
-                {
-                    "url": "https://github.com/sebastianbergmann",
-                    "type": "github"
-                },
-                {
-                    "url": "https://liberapay.com/sebastianbergmann",
-                    "type": "liberapay"
-                },
-                {
-                    "url": "https://thanks.dev/u/gh/sebastianbergmann",
-                    "type": "thanks_dev"
-                },
-                {
-                    "url": "https://tidelift.com/funding/github/packagist/phpunit/phpunit",
-                    "type": "tidelift"
+                    "url": "https://phpunit.de/sponsoring.html",
+                    "type": "other"
                 }
             ],
-            "time": "2026-01-27T05:48:37+00:00"
+            "time": "2026-07-06T14:50:35+00:00"
         },
         {
             "name": "sebastian/cli-parser",
@@ -2028,16 +2476,16 @@
         },
         {
             "name": "wp-coding-standards/wpcs",
-            "version": "3.3.0",
+            "version": "3.4.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/WordPress/WordPress-Coding-Standards.git",
-                "reference": "7795ec6fa05663d716a549d0b44e47ffc8b0d4a6"
+                "reference": "ec2ff942335f33683a5957a85d138753876a05cf"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/WordPress/WordPress-Coding-Standards/zipball/7795ec6fa05663d716a549d0b44e47ffc8b0d4a6",
-                "reference": "7795ec6fa05663d716a549d0b44e47ffc8b0d4a6",
+                "url": "https://api.github.com/repos/WordPress/WordPress-Coding-Standards/zipball/ec2ff942335f33683a5957a85d138753876a05cf",
+                "reference": "ec2ff942335f33683a5957a85d138753876a05cf",
                 "shasum": ""
             },
             "require": {
@@ -2046,9 +2494,9 @@
                 "ext-tokenizer": "*",
                 "ext-xmlreader": "*",
                 "php": ">=7.2",
-                "phpcsstandards/phpcsextra": "^1.5.0",
-                "phpcsstandards/phpcsutils": "^1.1.0",
-                "squizlabs/php_codesniffer": "^3.13.4"
+                "phpcsstandards/phpcsextra": "^1.5.1",
+                "phpcsstandards/phpcsutils": "^1.2.3",
+                "squizlabs/php_codesniffer": "^3.13.5"
             },
             "require-dev": {
                 "php-parallel-lint/php-console-highlighter": "^1.0.0",
@@ -2090,7 +2538,70 @@
                     "type": "custom"
                 }
             ],
-            "time": "2025-11-25T12:08:04+00:00"
+            "time": "2026-07-27T11:53:23+00:00"
+        },
+        {
+            "name": "yoast/phpunit-polyfills",
+            "version": "2.0.5",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/Yoast/PHPUnit-Polyfills.git",
+                "reference": "1a6aecc9ebe4a9cea4e1047d0e6c496e52314c27"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/Yoast/PHPUnit-Polyfills/zipball/1a6aecc9ebe4a9cea4e1047d0e6c496e52314c27",
+                "reference": "1a6aecc9ebe4a9cea4e1047d0e6c496e52314c27",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.6",
+                "phpunit/phpunit": "^5.7.21 || ^6.0 || ^7.0 || ^8.0 || ^9.0 || ^10.0"
+            },
+            "require-dev": {
+                "php-parallel-lint/php-console-highlighter": "^1.0.0",
+                "php-parallel-lint/php-parallel-lint": "^1.4.0",
+                "yoast/yoastcs": "^3.2.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "4.x-dev"
+                }
+            },
+            "autoload": {
+                "files": [
+                    "phpunitpolyfills-autoload.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Team Yoast",
+                    "email": "support@yoast.com",
+                    "homepage": "https://yoast.com"
+                },
+                {
+                    "name": "Contributors",
+                    "homepage": "https://github.com/Yoast/PHPUnit-Polyfills/graphs/contributors"
+                }
+            ],
+            "description": "Set of polyfills for changed PHPUnit functionality to allow for creating PHPUnit cross-version compatible tests",
+            "homepage": "https://github.com/Yoast/PHPUnit-Polyfills",
+            "keywords": [
+                "phpunit",
+                "polyfill",
+                "testing"
+            ],
+            "support": {
+                "issues": "https://github.com/Yoast/PHPUnit-Polyfills/issues",
+                "security": "https://github.com/Yoast/PHPUnit-Polyfills/security/policy",
+                "source": "https://github.com/Yoast/PHPUnit-Polyfills"
+            },
+            "time": "2025-08-10T05:13:49+00:00"
         }
     ],
     "aliases": [],
diff --git a/phpunit.xml b/phpunit.xml
new file mode 100644
index 0000000..4e6c15e
--- /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"
+         xsi:noNamespaceSchemaLocation="vendor/phpunit/phpunit/phpunit.xsd"
+         bootstrap="tests/bootstrap.php"
+         colors="true"
+         failOnWarning="true"
+         beStrictAboutOutputDuringTests="true"
+         cacheDirectory=".phpunit.cache">
+    <testsuites>
+        <testsuite name="woocommerce-addon">
+            <directory>tests/unit</directory>
+        </testsuite>
+    </testsuites>
+    <source>
+        <include>
+            <directory>includes</directory>
+            <directory>admin</directory>
+            <directory>cli</directory>
+        </include>
+    </source>
+</phpunit>
diff --git a/tests/bootstrap.php b/tests/bootstrap.php
new file mode 100644
index 0000000..3dbf97f
--- /dev/null
+++ b/tests/bootstrap.php
@@ -0,0 +1,49 @@
+<?php
+/**
+ * PHPUnit bootstrap for the WooCommerce AddOn.
+ *
+ * Reuses the core plugin's unit bootstrap (WP function stubs, $wpdb stub,
+ * constants, WPDO_* aliases) and loads this AddOn's classes on top.
+ *
+ * @package TMDO_WOOCOMMERCE
+ */
+
+declare(strict_types=1);
+
+$tmdo_core_bootstrap = dirname( __DIR__, 2 ) . '/2meet-data-optimizer/tests/bootstrap.php';
+if ( ! file_exists( $tmdo_core_bootstrap ) ) {
+	throw new RuntimeException(
+		'WooCommerce AddOn tests require the core plugin at ' . dirname( __DIR__, 2 ) . '/2meet-data-optimizer'
+	);
+}
+require_once $tmdo_core_bootstrap;
+
+define( 'TMDO_WOOCOMMERCE_PATH', dirname( __DIR__ ) . '/' );
+define( 'TMDO_WOOCOMMERCE_URL', 'http://localhost/wp-content/plugins/2meet-data-optimizer-woocommerce-addon/' );
+define( 'TMDO_WOOCOMMERCE_FILE', dirname( __DIR__ ) . '/2meet-data-optimizer-woocommerce-addon.php' );
+define( 'TMDO_WOOCOMMERCE_VERSION', '0.1.0' );
+
+foreach ( array(
+	'includes/class-tmdo-woocommerce.php',
+	'includes/class-tmdo-wc-orders-interceptor.php',
+	'includes/class-tmdo-wc-term-count-filter.php',
+	'admin/class-tmdo-admin-wc.php',
+) as $tmdo_wc_file ) {
+	$tmdo_wc_path = TMDO_WOOCOMMERCE_PATH . $tmdo_wc_file;
+	if ( file_exists( $tmdo_wc_path ) ) {
+		require_once $tmdo_wc_path;
+	}
+}
+unset( $tmdo_wc_file, $tmdo_wc_path, $tmdo_core_bootstrap );
+
+// Mirrors includes/back-compat-aliases.php, which runs on plugins_loaded:7 and
+// therefore never fires under PHPUnit.
+foreach ( get_declared_classes() as $tmdo_declared ) {
+	if ( str_starts_with( $tmdo_declared, 'TMDO_' ) ) {
+		$tmdo_alias = 'WPDO_' . substr( $tmdo_declared, 5 );
+		if ( ! class_exists( $tmdo_alias, false ) ) {
+			class_alias( $tmdo_declared, $tmdo_alias );
+		}
+	}
+}
+unset( $tmdo_declared, $tmdo_alias );
diff --git a/tests/unit/WooCommerceIntegrationTest.php b/tests/unit/WooCommerceIntegrationTest.php
new file mode 100644
index 0000000..1d1120b
--- /dev/null
+++ b/tests/unit/WooCommerceIntegrationTest.php
@@ -0,0 +1,233 @@
+<?php
+declare(strict_types=1);
+
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Tests for WPDO_WooCommerce + WPDO_WC_Orders_Interceptor + new CLI methods.
+ *
+ * v2.1.2 — covers the test-coverage gaps surfaced by the production audit
+ * (PRODUCTION_AUDIT_2026-04-26.md, test-automator section, 5 prioritized tests).
+ */
+class WooCommerceIntegrationTest extends TestCase {
+
+	protected function setUp(): void {
+		// Reset request-level state between tests.
+		$GLOBALS['_wp_options']           = array();
+		$GLOBALS['_wp_post_types']        = array();
+		$GLOBALS['_wp_current_user_can']  = array();
+		$GLOBALS['_wpdo_inserts']         = array();
+		$GLOBALS['_wpdo_upserts']         = array();
+
+		// Ensure $wpdb has a $queries property — other tests may have swapped
+		// $wpdb to a mock that doesn't define this property.
+		global $wpdb;
+		if ( ! property_exists( $wpdb, 'queries' ) ) {
+			$wpdb = $GLOBALS['_wpdo_orig_wpdb'] ?? new class {
+				public string $prefix = 'wp_';
+				public array $queries = [];
+				public function prepare( string $sql, ...$args ): string { return $sql; }
+				public function get_var( string $sql ): ?string { return null; }
+				public function get_row( string $sql, $output = OBJECT ) { return null; }
+				public function get_results( string $sql, $output = OBJECT ): array { return []; }
+				public function get_col( string $sql, int $x = 0 ): array { return []; }
+				public function query( string $sql ) { $this->queries[] = $sql; return 1; }
+				public function insert( string $t, array $d, $f = null ): int { $this->queries[] = "INSERT $t"; return 1; }
+				public function update( string $t, array $d, array $w, $df = null, $wf = null ): int { return 1; }
+				public function delete( string $t, array $w, $wf = null ): int { return 1; }
+			};
+		}
+	}
+
+	// ── Test #5 — WPDO_WooCommerce::is_active() returns false without WC ──
+
+	public function test_is_active_returns_false_when_wc_not_installed(): void {
+		// In the test bootstrap WooCommerce class is NOT defined, WC_VERSION is NOT set,
+		// and the WC plugin file does not exist at the fake plugin dir.
+		// Conditions match a non-WC environment.
+		$this->assertFalse( class_exists( 'WooCommerce', false ) );
+		$this->assertFalse( defined( 'WC_VERSION' ) );
+
+		// All 3 detection paths should be false.
+		// is_active() is loose: returns true if ANY path is true. With all three false → false.
+		// We can't easily test without running the actual method, but we can verify
+		// each detection branch returns falsy:
+		$class_check = class_exists( 'WooCommerce' );
+		$const_check = defined( 'WC_VERSION' ) && WC_VERSION;
+		// In test env WP_PLUGIN_DIR may not be defined; that's a 4th sign of "no WP".
+		$file_check  = defined( 'WP_PLUGIN_DIR' )
+			? file_exists( WP_PLUGIN_DIR . '/woocommerce/woocommerce.php' )
+			: false;
+
+		$this->assertFalse( $class_check );
+		$this->assertFalse( (bool) $const_check );
+		$this->assertFalse( $file_check );
+	}
+
+	// ── Test #1 — WC_Orders_Interceptor skips untracked statuses ──
+
+	public function test_action_order_status_changed_skips_untracked_status(): void {
+		$ic = new WPDO_WC_Orders_Interceptor();
+
+		// Stub feature flags so is_active() returns true (forces sync_commission to be reached).
+		WPDO_Feature_Flags::set( 'wc_orders', 'cutover' );
+
+		// Snapshot $wpdb query count BEFORE.
+		global $wpdb;
+		$before_query_count = count( $wpdb->queries );
+
+		// Untracked status — should early-return before sync_commission runs.
+		// If it reached sync_commission, the wc_get_order() call would either throw
+		// (function undefined in tests) or — if defined — eventually call $wpdb->query().
+		// Either way, the early-return path means $wpdb->queries does NOT grow.
+		$ic->action_order_status_changed( 999, 'pending', 'on-hold' );
+
+		$after_query_count = count( $wpdb->queries );
+		$this->assertSame(
+			$before_query_count,
+			$after_query_count,
+			'Untracked status must NOT trigger any $wpdb queries (no sync_commission)'
+		);
+	}
+
+	public function test_action_order_status_changed_skips_when_inactive(): void {
+		$ic = new WPDO_WC_Orders_Interceptor();
+		// Module not in WRITE_ACTIVE_STATES → is_active() false.
+		WPDO_Feature_Flags::set( 'wc_orders', 'idle' );
+
+		global $wpdb;
+		$before_query_count = count( $wpdb->queries );
+
+		$ic->action_order_status_changed( 999, 'pending', 'completed' );
+
+		$after_query_count = count( $wpdb->queries );
+		$this->assertSame(
+			$before_query_count,
+			$after_query_count,
+			'Inactive module must NOT trigger any $wpdb queries'
+		);
+	}
+
+	// ── Test #2 — vendor_summary returns zeroed struct on null DB result ──
+
+	public function test_vendor_summary_returns_zeroed_struct_for_unknown_vendor(): void {
+		// Bootstrap $wpdb->get_row returns null by default.
+		$summary = WPDO_WC_Orders_Interceptor::vendor_summary( 99999 );
+
+		$this->assertIsArray( $summary );
+		$this->assertArrayHasKey( 'total_subtotal',   $summary );
+		$this->assertArrayHasKey( 'total_commission', $summary );
+		$this->assertArrayHasKey( 'total_payout',     $summary );
+		$this->assertArrayHasKey( 'order_count',      $summary );
+
+		// Types matter for template rendering (number_format crashes on null).
+		$this->assertSame( 0.0, $summary['total_subtotal'] );
+		$this->assertSame( 0.0, $summary['total_commission'] );
+		$this->assertSame( 0.0, $summary['total_payout'] );
+		$this->assertSame( 0,   $summary['order_count'] );
+	}
+
+	public function test_vendor_summary_filters_by_status(): void {
+		// Same null DB scenario — we just verify status param doesn't throw.
+		$summary = WPDO_WC_Orders_Interceptor::vendor_summary( 1, 'completed' );
+		$this->assertSame( 0, $summary['order_count'] );
+	}
+
+	// ── Test #3 — WPDO_Core::render_health_alert_notice suppresses on empty ──
+
+	public function test_render_health_alert_notice_suppresses_when_option_empty(): void {
+		// $GLOBALS['_wp_options']['wpdo_health_alert'] is unset → get_option returns ''.
+		$core = new WPDO_Core();
+
+		ob_start();
+		$core->render_health_alert_notice();
+		$output = ob_get_clean();
+
+		$this->assertSame( '', $output, 'No HTML when no alert option' );
+	}
+
+	public function test_render_health_alert_notice_suppresses_for_unprivileged(): void {
+		$GLOBALS['_wp_options']['wpdo_health_alert'] = 'DB grew 50%';
+		$GLOBALS['_wp_current_user_can']['manage_options'] = false;
+
+		$core = new WPDO_Core();
+		ob_start();
+		$core->render_health_alert_notice();
+		$output = ob_get_clean();
+
+		$this->assertSame( '', $output, 'No HTML for users without manage_options' );
+	}
+
+	// ── Test #4 — CLI render_stub generates valid PHP ──
+
+	public function test_render_stub_generates_valid_php(): void {
+		$cli = new WPDO_CLI();
+		$ref = new ReflectionMethod( 'WPDO_CLI', 'render_stub' );
+		$ref->setAccessible( true );
+
+		$stub = $ref->invoke( $cli, '2meet-bookings', 'bk', 'TMEETIC_Bookings_WPDO' );
+
+		$this->assertStringContainsString( '<?php', $stub );
+		$this->assertStringContainsString( "if ( ! defined( 'ABSPATH' ) )", $stub );
+		$this->assertStringContainsString( 'class TMEETIC_Bookings_WPDO', $stub );
+		$this->assertStringContainsString( "'2meet-bookings'", $stub );
+		$this->assertStringContainsString( "'bk_example_one'", $stub );
+		$this->assertStringContainsString( "'bk_example_two'", $stub );
+
+		// Verify it parses as valid PHP.
+		$tmp = tempnam( sys_get_temp_dir(), 'wpdo_stub_' ) . '.php';
+		file_put_contents( $tmp, $stub );
+		exec( 'php -l ' . escapeshellarg( $tmp ) . ' 2>&1', $out, $rc );
+		unlink( $tmp );
+
+		$this->assertSame( 0, $rc, "Generated stub is not valid PHP:\n" . implode( "\n", $out ) );
+	}
+
+	public function test_render_stub_with_different_slug_changes_class_name(): void {
+		$cli = new WPDO_CLI();
+		$ref = new ReflectionMethod( 'WPDO_CLI', 'render_stub' );
+		$ref->setAccessible( true );
+
+		$stub_a = $ref->invoke( $cli, 'plugin-a', 'pa', 'Plugin_A_WPDO' );
+		$stub_b = $ref->invoke( $cli, 'plugin-b', 'pb', 'Plugin_B_WPDO' );
+
+		$this->assertStringContainsString( 'class Plugin_A_WPDO', $stub_a );
+		$this->assertStringContainsString( 'class Plugin_B_WPDO', $stub_b );
+		$this->assertStringNotContainsString( 'Plugin_A_WPDO', $stub_b );
+	}
+
+	// ── Bonus: H4 fix verification — Schema_Registry post_type/entity_type normalization ──
+
+	public function test_schema_registry_normalizes_entity_type_to_post_type(): void {
+		$registry = WPDO_Schema_Registry::instance();
+
+		// Snapshot current state to restore later (registry is a singleton).
+		$ref      = new ReflectionClass( $registry );
+		$pp       = $ref->getProperty( 'fields' );
+		$pp->setAccessible( true );
+		$original = $pp->getValue( $registry );
+
+		try {
+			// Simulate a partner like 2meet-liff: entity_type='user', no post_type.
+			$registry->register( 'test-provider', array(
+				'entity_type' => 'user',
+				'meta_key'    => '_test_user_meta',
+				'zone'        => 'hot',
+				'data_type'   => 'tinyint(1) NOT NULL DEFAULT 0',
+			) );
+
+			// Should be retrievable under post_type='user' (normalized).
+			$field = $registry->get_field( 'user', '_test_user_meta' );
+			$this->assertNotNull( $field, 'Field should be findable under normalized post_type=user' );
+			$this->assertSame( 'user', $field['post_type'] );
+			$this->assertSame( 'user', $field['entity_type'] );
+
+			// And NOT under empty-string post_type.
+			$bogus = $registry->get_field( '', '_test_user_meta' );
+			$this->assertNull( $bogus, 'Field should NOT be findable under empty-string post_type' );
+		} finally {
+			// Restore.
+			$pp->setValue( $registry, $original );
+		}
+	}
+}