diff --git a/.gitignore b/.gitignore
index 7d7f20e4e541054d201980d84068049ac81b2575..1cdd93fd6cd04ef7e1dc0ddaf561825d0565f2ba 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,39 +1,48 @@
-# Created by https://www.toptal.com/developers/gitignore/api/phpunit,composer,visualstudiocode
-# Edit at https://www.toptal.com/developers/gitignore?templates=phpunit,composer,visualstudiocode
-
-### Composer ###
-composer.phar
-/vendor/
-
-# Commit your application's lock file https://getcomposer.org/doc/01-basic-usage.md#commit-your-composer-lock-file-to-version-control
-# You may choose to ignore a library lock file http://getcomposer.org/doc/02-libraries.md#lock-file
-# composer.lock
-
-### PHPUnit ###
-# Covers PHPUnit
-# Reference: https://phpunit.de/
-
-# Generated files
-.phpunit.result.cache
-
-# PHPUnit
-/app/phpunit.xml
-/phpunit.xml
-
-# Build data
-/build/
-
-### VisualStudioCode ###
-.vscode/*
-!.vscode/settings.json
-!.vscode/tasks.json
-!.vscode/launch.json
-!.vscode/extensions.json
-*.code-workspace
-
-### VisualStudioCode Patch ###
-# Ignore all local history of files
-.history
-.ionide
-
-# End of https://www.toptal.com/developers/gitignore/api/phpunit,composer,visualstudiocode
+# Created by https://www.toptal.com/developers/gitignore/api/phpunit,composer,visualstudiocode
+# Edit at https://www.toptal.com/developers/gitignore?templates=phpunit,composer,visualstudiocode
+
+### Composer ###
+composer.phar
+/vendor/
+
+# Commit your application's lock file https://getcomposer.org/doc/01-basic-usage.md#commit-your-composer-lock-file-to-version-control
+# You may choose to ignore a library lock file http://getcomposer.org/doc/02-libraries.md#lock-file
+# composer.lock
+
+### PHPUnit ###
+# Covers PHPUnit
+# Reference: https://phpunit.de/
+
+# Generated files
+.phpunit.result.cache
+
+# PHPUnit
+/app/phpunit.xml
+/phpunit.xml
+
+# Build data
+/build/
+
+### VisualStudioCode ###
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
+*.code-workspace
+
+### VisualStudioCode Patch ###
+# Ignore all local history of files
+.history
+.ionide
+
+# End of https://www.toptal.com/developers/gitignore/api/phpunit,composer,visualstudiocode
+
+### Project-specific ###
+
+# Google API credentials
+src/config/*.json
+
+# Environment variables
+.env
+!.env.example
diff --git a/README.md b/README.md
index 58a699f2f96227e695408366b8f9383630d9860b..9759cb1bb7c2aaf23daa2e8e8306923301f37c98 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,3 @@
-# Lion Game Backend _(liongame-backend)_
+# Lion Game - Backend _(liongame-backend)_
 
 TBD.
diff --git a/composer.json b/composer.json
index e6fb155084a30d9423cad262736c905752914083..3a27d4d2dd1c824874529d4ff1cef537d196867d 100644
--- a/composer.json
+++ b/composer.json
@@ -4,23 +4,38 @@
     "version": "0.1.0",
     "autoload": {
         "psr-4": {
-            "addianto\\LionGame\\Backend\\": "src/"
+            "addianto\\LionGame\\Backend\\": "src/",
+            "addianto\\LionGame\\Backend\\Config\\": "src/config/",
+            "addianto\\LionGame\\Backend\\Service\\": "src/service/"
         }
     },
     "autoload-dev": {
         "psr-4": {
-            "addianto\\LionGame\\Backend\\Test\\": "tests/"
+            "addianto\\LionGame\\Backend\\Test\\": "tests/",
+            "addianto\\LionGame\\Backend\\Test\\Config\\": "tests/config/"
         }
     },
     "require": {
+        "google/apiclient": "^2.8",
         "slim/slim": "^4.5",
-        "slim/psr7": "^1.2"
+        "slim/psr7": "^1.2",
+        "vlucas/phpdotenv": "^5.2"
     },
     "require-dev": {
         "friendsofphp/php-cs-fixer": "^2.15",
+        "php-mock/php-mock-phpunit": "^2.6",
         "phpunit/phpunit": "^9"
     },
     "config": {
         "sort-packages": true
+    },
+    "scripts": {
+        "post-update-cmd": "Google\\Task\\Composer::cleanup",
+        "test": "phpunit tests/"
+    },
+    "extra": {
+        "google/apiclient-services": [
+            "Sheets"
+        ]
     }
 }
diff --git a/composer.lock b/composer.lock
index 68d91c6fd4a76b52adf77a3b254be37a2822276a..5edc499ca315280a7899e01bcfd99b46b4cd743c 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "606fe156b60108e10c413d1dda797b79",
+    "content-hash": "69f8854bea11845783251b07b439ec3d",
     "packages": [
         {
             "name": "fig/http-message-util",
@@ -59,33 +59,30 @@
             "time": "2020-02-05T20:36:27+00:00"
         },
         {
-            "name": "nikic/fast-route",
-            "version": "v1.3.0",
+            "name": "firebase/php-jwt",
+            "version": "v5.2.0",
             "source": {
                 "type": "git",
-                "url": "https://github.com/nikic/FastRoute.git",
-                "reference": "181d480e08d9476e61381e04a71b34dc0432e812"
+                "url": "https://github.com/firebase/php-jwt.git",
+                "reference": "feb0e820b8436873675fd3aca04f3728eb2185cb"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/nikic/FastRoute/zipball/181d480e08d9476e61381e04a71b34dc0432e812",
-                "reference": "181d480e08d9476e61381e04a71b34dc0432e812",
+                "url": "https://api.github.com/repos/firebase/php-jwt/zipball/feb0e820b8436873675fd3aca04f3728eb2185cb",
+                "reference": "feb0e820b8436873675fd3aca04f3728eb2185cb",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.4.0"
+                "php": ">=5.3.0"
             },
             "require-dev": {
-                "phpunit/phpunit": "^4.8.35|~5.7"
+                "phpunit/phpunit": ">=4.8 <=9"
             },
             "type": "library",
             "autoload": {
                 "psr-4": {
-                    "FastRoute\\": "src/"
-                },
-                "files": [
-                    "src/functions.php"
-                ]
+                    "Firebase\\JWT\\": "src"
+                }
             },
             "notification-url": "https://packagist.org/downloads/",
             "license": [
@@ -93,195 +90,208 @@
             ],
             "authors": [
                 {
-                    "name": "Nikita Popov",
-                    "email": "nikic@php.net"
+                    "name": "Neuman Vong",
+                    "email": "neuman+pear@twilio.com",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Anant Narayanan",
+                    "email": "anant@php.net",
+                    "role": "Developer"
                 }
             ],
-            "description": "Fast request router for PHP",
+            "description": "A simple library to encode and decode JSON Web Tokens (JWT) in PHP. Should conform to the current spec.",
+            "homepage": "https://github.com/firebase/php-jwt",
             "keywords": [
-                "router",
-                "routing"
+                "jwt",
+                "php"
             ],
-            "time": "2018-02-13T20:26:39+00:00"
+            "time": "2020-03-25T18:49:23+00:00"
         },
         {
-            "name": "psr/container",
-            "version": "1.0.0",
+            "name": "google/apiclient",
+            "version": "v2.8.0",
             "source": {
                 "type": "git",
-                "url": "https://github.com/php-fig/container.git",
-                "reference": "b7ce3b176482dbbc1245ebf52b181af44c2cf55f"
+                "url": "https://github.com/googleapis/google-api-php-client.git",
+                "reference": "cf9a070f9da78cd207a69b2a94832d381c8c4163"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/php-fig/container/zipball/b7ce3b176482dbbc1245ebf52b181af44c2cf55f",
-                "reference": "b7ce3b176482dbbc1245ebf52b181af44c2cf55f",
+                "url": "https://api.github.com/repos/googleapis/google-api-php-client/zipball/cf9a070f9da78cd207a69b2a94832d381c8c4163",
+                "reference": "cf9a070f9da78cd207a69b2a94832d381c8c4163",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.3.0"
+                "firebase/php-jwt": "~2.0||~3.0||~4.0||~5.0",
+                "google/apiclient-services": "~0.13",
+                "google/auth": "^1.10",
+                "guzzlehttp/guzzle": "~5.3.1||~6.0||~7.0",
+                "guzzlehttp/psr7": "^1.2",
+                "monolog/monolog": "^1.17|^2.0",
+                "php": ">=5.4",
+                "phpseclib/phpseclib": "~0.3.10||~2.0"
+            },
+            "require-dev": {
+                "cache/filesystem-adapter": "^0.3.2",
+                "composer/composer": "^1.10",
+                "dealerdirect/phpcodesniffer-composer-installer": "^0.5.0",
+                "phpcompatibility/php-compatibility": "^9.2",
+                "phpunit/phpunit": "^4.8.36|^5.0",
+                "squizlabs/php_codesniffer": "~2.3",
+                "symfony/css-selector": "~2.1",
+                "symfony/dom-crawler": "~2.1"
+            },
+            "suggest": {
+                "cache/filesystem-adapter": "For caching certs and tokens (using Google\\Client::setCache)"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.0.x-dev"
+                    "dev-master": "2.x-dev"
                 }
             },
             "autoload": {
                 "psr-4": {
-                    "Psr\\Container\\": "src/"
-                }
+                    "Google\\": "src/"
+                },
+                "files": [
+                    "src/aliases.php"
+                ],
+                "classmap": [
+                    "src/aliases.php"
+                ]
             },
             "notification-url": "https://packagist.org/downloads/",
             "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "PHP-FIG",
-                    "homepage": "http://www.php-fig.org/"
-                }
+                "Apache-2.0"
             ],
-            "description": "Common Container Interface (PHP FIG PSR-11)",
-            "homepage": "https://github.com/php-fig/container",
+            "description": "Client library for Google APIs",
+            "homepage": "http://developers.google.com/api-client-library/php",
             "keywords": [
-                "PSR-11",
-                "container",
-                "container-interface",
-                "container-interop",
-                "psr"
+                "google"
             ],
-            "time": "2017-02-14T16:28:37+00:00"
+            "time": "2020-10-23T20:29:29+00:00"
         },
         {
-            "name": "psr/http-factory",
-            "version": "1.0.1",
+            "name": "google/apiclient-services",
+            "version": "v0.151",
             "source": {
                 "type": "git",
-                "url": "https://github.com/php-fig/http-factory.git",
-                "reference": "12ac7fcd07e5b077433f5f2bee95b3a771bf61be"
+                "url": "https://github.com/googleapis/google-api-php-client-services.git",
+                "reference": "784a4fdb110b67a2344cfbdbf927194bd29f9e73"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/php-fig/http-factory/zipball/12ac7fcd07e5b077433f5f2bee95b3a771bf61be",
-                "reference": "12ac7fcd07e5b077433f5f2bee95b3a771bf61be",
+                "url": "https://api.github.com/repos/googleapis/google-api-php-client-services/zipball/784a4fdb110b67a2344cfbdbf927194bd29f9e73",
+                "reference": "784a4fdb110b67a2344cfbdbf927194bd29f9e73",
                 "shasum": ""
             },
             "require": {
-                "php": ">=7.0.0",
-                "psr/http-message": "^1.0"
+                "php": ">=5.4"
             },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "1.0.x-dev"
-                }
+            "require-dev": {
+                "phpunit/phpunit": "^4.8|^5"
             },
+            "type": "library",
             "autoload": {
-                "psr-4": {
-                    "Psr\\Http\\Message\\": "src/"
+                "psr-0": {
+                    "Google_Service_": "src"
                 }
             },
             "notification-url": "https://packagist.org/downloads/",
             "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "PHP-FIG",
-                    "homepage": "http://www.php-fig.org/"
-                }
+                "Apache-2.0"
             ],
-            "description": "Common interfaces for PSR-7 HTTP message factories",
+            "description": "Client library for Google APIs",
+            "homepage": "http://developers.google.com/api-client-library/php",
             "keywords": [
-                "factory",
-                "http",
-                "message",
-                "psr",
-                "psr-17",
-                "psr-7",
-                "request",
-                "response"
+                "google"
             ],
-            "time": "2019-04-30T12:38:16+00:00"
+            "time": "2020-10-19T00:26:26+00:00"
         },
         {
-            "name": "psr/http-message",
-            "version": "1.0.1",
+            "name": "google/auth",
+            "version": "v1.14.3",
             "source": {
                 "type": "git",
-                "url": "https://github.com/php-fig/http-message.git",
-                "reference": "f6561bf28d520154e4b0ec72be95418abe6d9363"
+                "url": "https://github.com/googleapis/google-auth-library-php.git",
+                "reference": "c1503299c779af0cbc99b43788f75930988852cf"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/php-fig/http-message/zipball/f6561bf28d520154e4b0ec72be95418abe6d9363",
-                "reference": "f6561bf28d520154e4b0ec72be95418abe6d9363",
+                "url": "https://api.github.com/repos/googleapis/google-auth-library-php/zipball/c1503299c779af0cbc99b43788f75930988852cf",
+                "reference": "c1503299c779af0cbc99b43788f75930988852cf",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.3.0"
+                "firebase/php-jwt": "~2.0|~3.0|~4.0|~5.0",
+                "guzzlehttp/guzzle": "^5.3.1|^6.2.1|^7.0",
+                "guzzlehttp/psr7": "^1.2",
+                "php": ">=5.4",
+                "psr/cache": "^1.0",
+                "psr/http-message": "^1.0"
             },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "1.0.x-dev"
-                }
+            "require-dev": {
+                "guzzlehttp/promises": "0.1.1|^1.3",
+                "kelvinmo/simplejwt": "^0.2.5",
+                "phpseclib/phpseclib": "^2",
+                "phpunit/phpunit": "^4.8.36|^5.7",
+                "sebastian/comparator": ">=1.2.3",
+                "squizlabs/php_codesniffer": "^3.5"
+            },
+            "suggest": {
+                "phpseclib/phpseclib": "May be used in place of OpenSSL for signing strings or for token management. Please require version ^2."
             },
+            "type": "library",
             "autoload": {
                 "psr-4": {
-                    "Psr\\Http\\Message\\": "src/"
+                    "Google\\Auth\\": "src"
                 }
             },
             "notification-url": "https://packagist.org/downloads/",
             "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "PHP-FIG",
-                    "homepage": "http://www.php-fig.org/"
-                }
+                "Apache-2.0"
             ],
-            "description": "Common interface for HTTP messages",
-            "homepage": "https://github.com/php-fig/http-message",
+            "description": "Google Auth Library for PHP",
+            "homepage": "http://github.com/google/google-auth-library-php",
             "keywords": [
-                "http",
-                "http-message",
-                "psr",
-                "psr-7",
-                "request",
-                "response"
+                "Authentication",
+                "google",
+                "oauth2"
             ],
-            "time": "2016-08-06T14:39:51+00:00"
+            "time": "2020-10-16T21:33:48+00:00"
         },
         {
-            "name": "psr/http-server-handler",
-            "version": "1.0.1",
+            "name": "graham-campbell/result-type",
+            "version": "v1.0.1",
             "source": {
                 "type": "git",
-                "url": "https://github.com/php-fig/http-server-handler.git",
-                "reference": "aff2f80e33b7f026ec96bb42f63242dc50ffcae7"
+                "url": "https://github.com/GrahamCampbell/Result-Type.git",
+                "reference": "7e279d2cd5d7fbb156ce46daada972355cea27bb"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/php-fig/http-server-handler/zipball/aff2f80e33b7f026ec96bb42f63242dc50ffcae7",
-                "reference": "aff2f80e33b7f026ec96bb42f63242dc50ffcae7",
+                "url": "https://api.github.com/repos/GrahamCampbell/Result-Type/zipball/7e279d2cd5d7fbb156ce46daada972355cea27bb",
+                "reference": "7e279d2cd5d7fbb156ce46daada972355cea27bb",
                 "shasum": ""
             },
             "require": {
-                "php": ">=7.0",
-                "psr/http-message": "^1.0"
+                "php": "^7.0|^8.0",
+                "phpoption/phpoption": "^1.7.3"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^6.5|^7.5|^8.5|^9.0"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.0.x-dev"
+                    "dev-master": "1.0-dev"
                 }
             },
             "autoload": {
                 "psr-4": {
-                    "Psr\\Http\\Server\\": "src/"
+                    "GrahamCampbell\\ResultType\\": "src/"
                 }
             },
             "notification-url": "https://packagist.org/downloads/",
@@ -290,53 +300,78 @@
             ],
             "authors": [
                 {
-                    "name": "PHP-FIG",
-                    "homepage": "http://www.php-fig.org/"
+                    "name": "Graham Campbell",
+                    "email": "graham@alt-three.com"
                 }
             ],
-            "description": "Common interface for HTTP server-side request handler",
+            "description": "An Implementation Of The Result Type",
             "keywords": [
-                "handler",
-                "http",
-                "http-interop",
-                "psr",
-                "psr-15",
-                "psr-7",
-                "request",
-                "response",
-                "server"
+                "Graham Campbell",
+                "GrahamCampbell",
+                "Result Type",
+                "Result-Type",
+                "result"
             ],
-            "time": "2018-10-30T16:46:14+00:00"
+            "funding": [
+                {
+                    "url": "https://github.com/GrahamCampbell",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/graham-campbell/result-type",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2020-04-13T13:17:36+00:00"
         },
         {
-            "name": "psr/http-server-middleware",
-            "version": "1.0.1",
+            "name": "guzzlehttp/guzzle",
+            "version": "7.2.0",
             "source": {
                 "type": "git",
-                "url": "https://github.com/php-fig/http-server-middleware.git",
-                "reference": "2296f45510945530b9dceb8bcedb5cb84d40c5f5"
+                "url": "https://github.com/guzzle/guzzle.git",
+                "reference": "0aa74dfb41ae110835923ef10a9d803a22d50e79"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/php-fig/http-server-middleware/zipball/2296f45510945530b9dceb8bcedb5cb84d40c5f5",
-                "reference": "2296f45510945530b9dceb8bcedb5cb84d40c5f5",
+                "url": "https://api.github.com/repos/guzzle/guzzle/zipball/0aa74dfb41ae110835923ef10a9d803a22d50e79",
+                "reference": "0aa74dfb41ae110835923ef10a9d803a22d50e79",
                 "shasum": ""
             },
             "require": {
-                "php": ">=7.0",
-                "psr/http-message": "^1.0",
-                "psr/http-server-handler": "^1.0"
+                "ext-json": "*",
+                "guzzlehttp/promises": "^1.4",
+                "guzzlehttp/psr7": "^1.7",
+                "php": "^7.2.5 || ^8.0",
+                "psr/http-client": "^1.0"
+            },
+            "provide": {
+                "psr/http-client-implementation": "1.0"
+            },
+            "require-dev": {
+                "ext-curl": "*",
+                "php-http/client-integration-tests": "^3.0",
+                "phpunit/phpunit": "^8.5.5 || ^9.3.5",
+                "psr/log": "^1.1"
+            },
+            "suggest": {
+                "ext-curl": "Required for CURL handler support",
+                "ext-intl": "Required for Internationalized Domain Name (IDN) support",
+                "psr/log": "Required for using the Log middleware"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.0.x-dev"
+                    "dev-master": "7.1-dev"
                 }
             },
             "autoload": {
                 "psr-4": {
-                    "Psr\\Http\\Server\\": "src/"
-                }
+                    "GuzzleHttp\\": "src/"
+                },
+                "files": [
+                    "src/functions_include.php"
+                ]
             },
             "notification-url": "https://packagist.org/downloads/",
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@@ -344,50 +379,82 @@
             ],
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                 {
-                    "name": "PHP-FIG",
-                    "homepage": "http://www.php-fig.org/"
+                    "name": "Michael Dowling",
+                    "email": "mtdowling@gmail.com",
+                    "homepage": "https://github.com/mtdowling"
+                },
+                {
+                    "name": "Márk Sági-Kazár",
+                    "email": "mark.sagikazar@gmail.com",
+                    "homepage": "https://sagikazarmark.hu"
                 }
             ],
-            "description": "Common interface for HTTP server-side middleware",
+            "description": "Guzzle is a PHP HTTP client library",
+            "homepage": "http://guzzlephp.org/",
             "keywords": [
+                "client",
+                "curl",
+                "framework",
                 "http",
-                "http-interop",
-                "middleware",
-                "psr",
-                "psr-15",
+                "http client",
+                "psr-18",
                 "psr-7",
-                "request",
-                "response"
+                "rest",
+                "web service"
             ],
-            "time": "2018-10-30T17:12:04+00:00"
+            "funding": [
+                {
+                    "url": "https://github.com/GrahamCampbell",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/Nyholm",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/alexeyshockov",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/gmponos",
+                    "type": "github"
+                }
+            ],
+            "time": "2020-10-10T11:47:56+00:00"
         },
         {
-            "name": "psr/log",
-            "version": "1.1.3",
+            "name": "guzzlehttp/promises",
+            "version": "1.4.0",
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-                "url": "https://github.com/php-fig/log.git",
-                "reference": "0f73288fd15629204f9d42b7055f72dacbe811fc"
+                "url": "https://github.com/guzzle/promises.git",
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+                "reference": "60d379c243457e073cff02bc323a2a86cb355631",
                 "shasum": ""
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+                "php": ">=5.5"
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+            "require-dev": {
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             },
             "type": "library",
             "extra": {
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+                    "dev-master": "1.4-dev"
                 }
             },
             "autoload": {
                 "psr-4": {
-                    "Psr\\Log\\": "Psr/Log/"
-                }
+                    "GuzzleHttp\\Promise\\": "src/"
+                },
+                "files": [
+                    "src/functions_include.php"
+                ]
             },
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@@ -395,44 +462,58 @@
             ],
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-                    "name": "PHP-FIG",
-                    "homepage": "http://www.php-fig.org/"
+                    "name": "Michael Dowling",
+                    "email": "mtdowling@gmail.com",
+                    "homepage": "https://github.com/mtdowling"
                 }
             ],
-            "description": "Common interface for logging libraries",
-            "homepage": "https://github.com/php-fig/log",
+            "description": "Guzzle promises library",
             "keywords": [
-                "log",
-                "psr",
-                "psr-3"
+                "promise"
             ],
-            "time": "2020-03-23T09:12:05+00:00"
+            "time": "2020-09-30T07:37:28+00:00"
         },
         {
-            "name": "ralouphie/getallheaders",
-            "version": "3.0.3",
+            "name": "guzzlehttp/psr7",
+            "version": "1.7.0",
             "source": {
                 "type": "git",
-                "url": "https://github.com/ralouphie/getallheaders.git",
-                "reference": "120b605dfeb996808c31b6477290a714d356e822"
+                "url": "https://github.com/guzzle/psr7.git",
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-                "reference": "120b605dfeb996808c31b6477290a714d356e822",
+                "url": "https://api.github.com/repos/guzzle/psr7/zipball/53330f47520498c0ae1f61f7e2c90f55690c06a3",
+                "reference": "53330f47520498c0ae1f61f7e2c90f55690c06a3",
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             },
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+                "php": ">=5.4.0",
+                "psr/http-message": "~1.0",
+                "ralouphie/getallheaders": "^2.0.5 || ^3.0.0"
+            },
+            "provide": {
+                "psr/http-message-implementation": "1.0"
             },
             "require-dev": {
-                "php-coveralls/php-coveralls": "^2.1",
-                "phpunit/phpunit": "^5 || ^6.5"
+                "ext-zlib": "*",
+                "phpunit/phpunit": "~4.8.36 || ^5.7.27 || ^6.5.14 || ^7.5.20 || ^8.5.8 || ^9.3.10"
+            },
+            "suggest": {
+                "laminas/laminas-httphandlerrunner": "Emit PSR-7 responses"
             },
             "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.7-dev"
+                }
+            },
             "autoload": {
-                "files": [
-                    "src/getallheaders.php"
+                "psr-4": {
+                    "GuzzleHttp\\Psr7\\": "src/"
+                },
+                "files": [
+                    "src/functions_include.php"
                 ]
             },
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@@ -441,52 +522,1142 @@
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                 {
-                    "name": "Ralph Khattar",
-                    "email": "ralph.khattar@gmail.com"
+                    "name": "Michael Dowling",
+                    "email": "mtdowling@gmail.com",
+                    "homepage": "https://github.com/mtdowling"
+                },
+                {
+                    "name": "Tobias Schultze",
+                    "homepage": "https://github.com/Tobion"
                 }
             ],
-            "description": "A polyfill for getallheaders.",
-            "time": "2019-03-08T08:55:37+00:00"
+            "description": "PSR-7 message implementation that also provides common utility methods",
+            "keywords": [
+                "http",
+                "message",
+                "psr-7",
+                "request",
+                "response",
+                "stream",
+                "uri",
+                "url"
+            ],
+            "time": "2020-09-30T07:37:11+00:00"
         },
         {
-            "name": "slim/psr7",
-            "version": "1.2.0",
+            "name": "monolog/monolog",
+            "version": "2.1.1",
             "source": {
                 "type": "git",
-                "url": "https://github.com/slimphp/Slim-Psr7.git",
-                "reference": "832912cb3c2a807d472ef0ac392552e85703a667"
+                "url": "https://github.com/Seldaek/monolog.git",
+                "reference": "f9eee5cec93dfb313a38b6b288741e84e53f02d5"
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             "dist": {
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-                "php": "^7.2",
-                "psr/http-factory": "^1.0",
-                "psr/http-message": "^1.0",
-                "ralouphie/getallheaders": "^3"
+                "php": ">=7.2",
+                "psr/log": "^1.0.1"
             },
             "provide": {
-                "psr/http-factory-implementation": "1.0",
-                "psr/http-message-implementation": "1.0"
+                "psr/log-implementation": "1.0.0"
+            },
+            "require-dev": {
+                "aws/aws-sdk-php": "^2.4.9 || ^3.0",
+                "doctrine/couchdb": "~1.0@dev",
+                "elasticsearch/elasticsearch": "^6.0",
+                "graylog2/gelf-php": "^1.4.2",
+                "php-amqplib/php-amqplib": "~2.4",
+                "php-console/php-console": "^3.1.3",
+                "php-parallel-lint/php-parallel-lint": "^1.0",
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+                "predis/predis": "^1.1",
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+                "ruflin/elastica": ">=0.90 <3.0",
+                "swiftmailer/swiftmailer": "^5.3|^6.0"
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+            "suggest": {
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+                "doctrine/couchdb": "Allow sending log messages to a CouchDB server",
+                "elasticsearch/elasticsearch": "Allow sending log messages to an Elasticsearch server via official client",
+                "ext-amqp": "Allow sending log messages to an AMQP server (1.0+ required)",
+                "ext-mbstring": "Allow to work properly with unicode symbols",
+                "ext-mongodb": "Allow sending log messages to a MongoDB server (via driver)",
+                "graylog2/gelf-php": "Allow sending log messages to a GrayLog2 server",
+                "mongodb/mongodb": "Allow sending log messages to a MongoDB server (via library)",
+                "php-amqplib/php-amqplib": "Allow sending log messages to an AMQP server using php-amqplib",
+                "php-console/php-console": "Allow sending log messages to Google Chrome",
+                "rollbar/rollbar": "Allow sending log messages to Rollbar",
+                "ruflin/elastica": "Allow sending log messages to an Elastic Search server"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Monolog\\": "src/Monolog"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
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+                    "name": "Jordi Boggiano",
+                    "email": "j.boggiano@seld.be",
+                    "homepage": "http://seld.be"
+                }
+            ],
+            "description": "Sends your logs to files, sockets, inboxes, databases and various web services",
+            "homepage": "http://github.com/Seldaek/monolog",
+            "keywords": [
+                "log",
+                "logging",
+                "psr-3"
+            ],
+            "funding": [
+                {
+                    "url": "https://github.com/Seldaek",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/monolog/monolog",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2020-07-23T08:41:23+00:00"
+        },
+        {
+            "name": "nikic/fast-route",
+            "version": "v1.3.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/nikic/FastRoute.git",
+                "reference": "181d480e08d9476e61381e04a71b34dc0432e812"
+            },
+            "dist": {
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+            },
+            "require": {
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+            },
+            "require-dev": {
+                "phpunit/phpunit": "^4.8.35|~5.7"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
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+                },
+                "files": [
+                    "src/functions.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Nikita Popov",
+                    "email": "nikic@php.net"
+                }
+            ],
+            "description": "Fast request router for PHP",
+            "keywords": [
+                "router",
+                "routing"
+            ],
+            "time": "2018-02-13T20:26:39+00:00"
+        },
+        {
+            "name": "phpoption/phpoption",
+            "version": "1.7.5",
+            "source": {
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+                "url": "https://github.com/schmittjoh/php-option.git",
+                "reference": "994ecccd8f3283ecf5ac33254543eb0ac946d525"
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+            },
+            "require-dev": {
+                "bamarni/composer-bin-plugin": "^1.4.1",
+                "phpunit/phpunit": "^4.8.35 || ^5.7.27 || ^6.5.6 || ^7.0 || ^8.0 || ^9.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.7-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "PhpOption\\": "src/PhpOption/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "Apache-2.0"
+            ],
+            "authors": [
+                {
+                    "name": "Johannes M. Schmitt",
+                    "email": "schmittjoh@gmail.com"
+                },
+                {
+                    "name": "Graham Campbell",
+                    "email": "graham@alt-three.com"
+                }
+            ],
+            "description": "Option Type for PHP",
+            "keywords": [
+                "language",
+                "option",
+                "php",
+                "type"
+            ],
+            "funding": [
+                {
+                    "url": "https://github.com/GrahamCampbell",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/phpoption/phpoption",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2020-07-20T17:29:33+00:00"
+        },
+        {
+            "name": "phpseclib/phpseclib",
+            "version": "2.0.29",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phpseclib/phpseclib.git",
+                "reference": "497856a8d997f640b4a516062f84228a772a48a8"
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+                "squizlabs/php_codesniffer": "~2.0"
+            },
+            "suggest": {
+                "ext-gmp": "Install the GMP (GNU Multiple Precision) extension in order to speed up arbitrary precision integer arithmetic operations.",
+                "ext-libsodium": "SSH2/SFTP can make use of some algorithms provided by the libsodium-php extension.",
+                "ext-mcrypt": "Install the Mcrypt extension in order to speed up a few other cryptographic operations.",
+                "ext-openssl": "Install the OpenSSL extension in order to speed up a wide variety of cryptographic operations."
+            },
+            "type": "library",
+            "autoload": {
+                "files": [
+                    "phpseclib/bootstrap.php"
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+            "authors": [
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+                    "name": "Jim Wigginton",
+                    "email": "terrafrost@php.net",
+                    "role": "Lead Developer"
+                },
+                {
+                    "name": "Patrick Monnerat",
+                    "email": "pm@datasphere.ch",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Andreas Fischer",
+                    "email": "bantu@phpbb.com",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Hans-Jürgen Petrich",
+                    "email": "petrich@tronic-media.com",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Graham Campbell",
+                    "email": "graham@alt-three.com",
+                    "role": "Developer"
+                }
+            ],
+            "description": "PHP Secure Communications Library - Pure-PHP implementations of RSA, AES, SSH2, SFTP, X.509 etc.",
+            "homepage": "http://phpseclib.sourceforge.net",
+            "keywords": [
+                "BigInteger",
+                "aes",
+                "asn.1",
+                "asn1",
+                "blowfish",
+                "crypto",
+                "cryptography",
+                "encryption",
+                "rsa",
+                "security",
+                "sftp",
+                "signature",
+                "signing",
+                "ssh",
+                "twofish",
+                "x.509",
+                "x509"
+            ],
+            "funding": [
+                {
+                    "url": "https://github.com/terrafrost",
+                    "type": "github"
+                },
+                {
+                    "url": "https://www.patreon.com/phpseclib",
+                    "type": "patreon"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/phpseclib/phpseclib",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2020-09-08T04:24:43+00:00"
+        },
+        {
+            "name": "psr/cache",
+            "version": "1.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/php-fig/cache.git",
+                "reference": "d11b50ad223250cf17b86e38383413f5a6764bf8"
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+                "psr-4": {
+                    "Psr\\Cache\\": "src/"
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+            },
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+            "license": [
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+            "authors": [
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+                    "name": "PHP-FIG",
+                    "homepage": "http://www.php-fig.org/"
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+            ],
+            "description": "Common interface for caching libraries",
+            "keywords": [
+                "cache",
+                "psr",
+                "psr-6"
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+            "time": "2016-08-06T20:24:11+00:00"
+        },
+        {
+            "name": "psr/container",
+            "version": "1.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/php-fig/container.git",
+                "reference": "b7ce3b176482dbbc1245ebf52b181af44c2cf55f"
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+            "type": "library",
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+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
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+            "authors": [
+                {
+                    "name": "PHP-FIG",
+                    "homepage": "http://www.php-fig.org/"
+                }
+            ],
+            "description": "Common Container Interface (PHP FIG PSR-11)",
+            "homepage": "https://github.com/php-fig/container",
+            "keywords": [
+                "PSR-11",
+                "container",
+                "container-interface",
+                "container-interop",
+                "psr"
+            ],
+            "time": "2017-02-14T16:28:37+00:00"
+        },
+        {
+            "name": "psr/http-client",
+            "version": "1.0.1",
+            "source": {
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-                    "homepage": "http://www.lgse.com"
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@@ -759,20 +1910,20 @@
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@@ -782,13 +1933,14 @@
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@@ -823,13 +1975,13 @@
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+                    "email": "markus@malkusch.de",
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@@ -3448,82 +4771,6 @@
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@@ -3683,83 +4930,6 @@
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-        {
-            "name": "symfony/polyfill-mbstring",
-            "version": "v1.19.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/symfony/polyfill-mbstring.git",
-                "reference": "b5f7b932ee6fa802fc792eabd77c4c88084517ce"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-mbstring/zipball/b5f7b932ee6fa802fc792eabd77c4c88084517ce",
-                "reference": "b5f7b932ee6fa802fc792eabd77c4c88084517ce",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=5.3.3"
-            },
-            "suggest": {
-                "ext-mbstring": "For best performance"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-main": "1.19-dev"
-                },
-                "thanks": {
-                    "name": "symfony/polyfill",
-                    "url": "https://github.com/symfony/polyfill"
-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "Symfony\\Polyfill\\Mbstring\\": ""
-                },
-                "files": [
-                    "bootstrap.php"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Nicolas Grekas",
-                    "email": "p@tchwork.com"
-                },
-                {
-                    "name": "Symfony Community",
-                    "homepage": "https://symfony.com/contributors"
-                }
-            ],
-            "description": "Symfony polyfill for the Mbstring extension",
-            "homepage": "https://symfony.com",
-            "keywords": [
-                "compatibility",
-                "mbstring",
-                "polyfill",
-                "portable",
-                "shim"
-            ],
-            "funding": [
-                {
-                    "url": "https://symfony.com/sponsor",
-                    "type": "custom"
-                },
-                {
-                    "url": "https://github.com/fabpot",
-                    "type": "github"
-                },
-                {
-                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
-                    "type": "tidelift"
-                }
-            ],
-            "time": "2020-10-23T09:01:57+00:00"
-        },
         {
             "name": "symfony/polyfill-php70",
             "version": "v1.19.0",
@@ -3986,86 +5156,6 @@
             ],
             "time": "2020-10-23T09:01:57+00:00"
         },
-        {
-            "name": "symfony/polyfill-php80",
-            "version": "v1.19.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/symfony/polyfill-php80.git",
-                "reference": "f54ef00f4678f348f133097fa8c3701d197ff44d"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-php80/zipball/f54ef00f4678f348f133097fa8c3701d197ff44d",
-                "reference": "f54ef00f4678f348f133097fa8c3701d197ff44d",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=7.0.8"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-main": "1.19-dev"
-                },
-                "thanks": {
-                    "name": "symfony/polyfill",
-                    "url": "https://github.com/symfony/polyfill"
-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "Symfony\\Polyfill\\Php80\\": ""
-                },
-                "files": [
-                    "bootstrap.php"
-                ],
-                "classmap": [
-                    "Resources/stubs"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Ion Bazan",
-                    "email": "ion.bazan@gmail.com"
-                },
-                {
-                    "name": "Nicolas Grekas",
-                    "email": "p@tchwork.com"
-                },
-                {
-                    "name": "Symfony Community",
-                    "homepage": "https://symfony.com/contributors"
-                }
-            ],
-            "description": "Symfony polyfill backporting some PHP 8.0+ features to lower PHP versions",
-            "homepage": "https://symfony.com",
-            "keywords": [
-                "compatibility",
-                "polyfill",
-                "portable",
-                "shim"
-            ],
-            "funding": [
-                {
-                    "url": "https://symfony.com/sponsor",
-                    "type": "custom"
-                },
-                {
-                    "url": "https://github.com/fabpot",
-                    "type": "github"
-                },
-                {
-                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
-                    "type": "tidelift"
-                }
-            ],
-            "time": "2020-10-23T09:01:57+00:00"
-        },
         {
             "name": "symfony/process",
             "version": "v5.1.7",
diff --git a/src/.env.example b/src/.env.example
new file mode 100644
index 0000000000000000000000000000000000000000..79d0e6f3e2e008ce3118146bc0f3f47645c7f542
--- /dev/null
+++ b/src/.env.example
@@ -0,0 +1,4 @@
+API_KEY=sha512(bangtoyib-cepatpulang)
+DEBUG=true
+GOOGLE_APPLICATION_CREDENTIALS=/opt/liongame/service-account.json
+SPREADSHEET_ID=1BxiMVs0XRA5nFMdKvBdBZjgmUUqptlbs74OgvE2upms
diff --git a/src/App.php b/src/App.php
index f2db0bb28aa788c5db7a201282c4a88237b06497..7f698ce14174635f488ab76301206148b073e148 100644
--- a/src/App.php
+++ b/src/App.php
@@ -7,17 +7,28 @@ use Psr\Http\Message\ServerRequestInterface as Request;
 use Psr\Http\Message\ResponseInterface as Response;
 use Slim\Factory\AppFactory;
 use Slim\App as SlimApp;
+use addianto\LionGame\Backend\Config\Config;
+use addianto\LionGame\Backend\Service\SheetsService;
 
 class App
 {
+    private string $apiKey;
     private SlimApp $app;
-
-    public function __construct(bool $debug = false)
-    {
+    private SheetsService $sheets;
+    private bool $debug;
+
+    public function __construct(
+        string $apiKey,
+        SheetsService $sheets,
+        bool $debug = false
+    ) {
+        $this->apiKey = $apiKey;
         $this->app = AppFactory::create();
+        $this->sheets = $sheets;
+        $this->debug = $debug;
 
-        $this->addErrorMiddleware($debug);
-        $this->handleBase();
+        $this->setupMiddleware();
+        $this->setupController();
     }
 
     public function get(): SlimApp
@@ -25,17 +36,17 @@ class App
         return $this->app;
     }
 
-    private function addErrorMiddleware(bool $debug = false): void
+    private function setupMiddleware(): void
     {
-        // Add error middleware
-        // Note: First arg should be set to false in production
-        $this->app->addErrorMiddleware($debug, true, true);
+        $this->app->addErrorMiddleware($this->debug, true, true);
     }
 
-    private function handleBase(): void
+    private function setupController(): void
     {
-        $this->app->get('/', function (Request $request, Response $response, $args) {
-            $response->getBody()->write("Hello, world!");
+        $this->app->post("/logs", function (Request $request, Response $response, $args) {
+            $response->getBody()->write(json_encode(array(
+                "message" => "TODO: Implement me!"
+            )));
             return $response;
         });
     }
diff --git a/src/config/Config.php b/src/config/Config.php
new file mode 100644
index 0000000000000000000000000000000000000000..e9c1d6024b6e2da5aca7cb9a6fa7bde38b45abd9
--- /dev/null
+++ b/src/config/Config.php
@@ -0,0 +1,32 @@
+<?php
+declare(strict_types=1);
+
+namespace addianto\LionGame\Backend\Config;
+
+use Google\Client;
+use Google_Service_Sheets as GoogleSheetsAPI;
+
+class Config
+{
+    private function __construct()
+    {
+        // Do nothing
+    }
+
+    public static function createGoogleAPIClient(string $appName, string $appCredentials): Client
+    {
+        $client = new Client();
+
+        $client->setApplicationName($appName);
+        $client->setAuthConfig($appCredentials);
+        $client->setScopes(GoogleSheetsAPI::SPREADSHEETS);
+        $client->setPrompt("none");
+
+        return $client;
+    }
+
+    public static function createGoogleSheetsAPI(Client $client): GoogleSheetsAPI
+    {
+        return new GoogleSheetsAPI($client);
+    }
+}
diff --git a/src/index.php b/src/index.php
index bece6b006e68e177224f6bf143e759c488331f7a..6f99f836e806dcc7afa00439233a70ad428f0dad 100644
--- a/src/index.php
+++ b/src/index.php
@@ -3,10 +3,33 @@ declare(strict_types=1);
 
 namespace addianto\LionGame\Backend;
 
+use Dotenv\Dotenv;
 use addianto\LionGame\Backend\App;
 
 require __DIR__ . '/../vendor/autoload.php';
 
+$dotenv = Dotenv::createImmutable(__DIR__);
+$dotenv->load();
+$dotenv->required("API_KEY");
+$dotenv->required("DEBUG");
+$dotenv->required("GOOGLE_APPLICATION_CREDENTIALS");
+$dotenv->required("SPREADSHEET_ID");
+
+// Wiring up the dependencies
+$sheetsService = SheetsService::getInstance(
+    Config::createGoogleSheetsAPI(
+        Config::createGoogleAPIClient(
+            "Lion Game - Backend",
+            $_ENV["GOOGLE_APPLICATION_CREDENTIALS"]
+        )
+    ),
+    $_ENV["SPREADSHEET_ID"]
+);
+
 // Run the app
-$app = (new App(true))->get();
+$app = (new App(
+    $_ENV["API_KEY"],
+    $sheetsService,
+    $_ENV["DEBUG"] === 'true'
+))->get();
 $app->run();
diff --git a/src/service/SheetsService.php b/src/service/SheetsService.php
new file mode 100644
index 0000000000000000000000000000000000000000..9c6a0c35c68b74fb9e7b0138e93bcba368286974
--- /dev/null
+++ b/src/service/SheetsService.php
@@ -0,0 +1,77 @@
+<?php
+declare(strict_types=1);
+
+namespace addianto\LionGame\Backend\Service;
+
+use Google_Service_Sheets as GoogleSheetsAPI;
+use Google_Service_Sheets_ValueRange as ValueRange;
+use Google_Service_Sheets_AppendValuesResponse as AppendValuesResponse;
+use is_null;
+
+class SheetsService
+{
+    private static ?SheetsService $instance = null;
+    private GoogleSheetsAPI $api;
+    private string $spreadsheetId;
+
+    private function __construct(GoogleSheetsAPI $api, string $spreadsheetId)
+    {
+        $this->api = $api;
+        $this->spreadsheetId = $spreadsheetId;
+    }
+
+    public function getValues(string $range): array
+    {
+        $values = array();
+
+        try {
+            $response = $this->api
+                ->spreadsheets_values
+                ->get($this->spreadsheetId, $range);
+
+            $values = $response->getValues();
+        } catch (Exception $e) {
+            error_log($e->getMessage());
+            error_log($e->getTraceAsString());
+        }
+
+        return $values;
+    }
+
+    public function appendValues(string $range, array $values): bool
+    {
+        $isAppended = false;
+
+        try {
+            $body = new ValueRange([
+                "majorDimension" => "ROWS",
+                "values" => array($values),
+            ]);
+
+            $optionalParameters = array(
+                "insertDataOption" => "INSERT_ROWS",
+                "valueInputOption" => "RAW",
+            );
+
+            $response = $this->api
+                ->spreadsheets_values
+                ->append($this->spreadsheetId, $range, $body, $optionalParameters);
+
+            $isAppended = true;
+        } catch (Exception $e) {
+            error_log($e->getMessage());
+            error_log($e->getTraceAsString());
+        }
+
+        return $isAppended;
+    }
+
+    public static function getInstance(GoogleSheetsAPI $api, string $spreadsheetId): SheetsService
+    {
+        if (is_null(self::$instance)) {
+            self::$instance = new SheetsService($api, $spreadsheetId);
+        }
+
+        return self::$instance;
+    }
+}
diff --git a/tests/AppTest.php b/tests/AppTest.php
index 0cc708b05be61a01ca2a16508ec7c851acc42889..3fb849c9e53d264dcac379fa0f87b5979acd279b 100644
--- a/tests/AppTest.php
+++ b/tests/AppTest.php
@@ -6,27 +6,62 @@ namespace addianto\LionGame\Backend\Test;
 use PHPUnit\Framework\TestCase;
 use Psr\Http\Message\ServerRequestInterface as Request;
 use Psr\Http\Message\ResponseInterface as Response;
+use Slim\Psr7\Factory\UriFactory;
 use Slim\Factory\ServerRequestCreatorFactory as RequestFactory;
 use Slim\App as SlimApp;
+use addianto\LionGame\Backend\Service\SheetsService;
 use addianto\LionGame\Backend\App;
 
+use json_decode;
+use json_last_error;
+use strtoupper;
+
 class AppTest extends TestCase
 {
-    protected SlimApp $app;
+    const API_KEY = "12345";
+    const DEBUG = false;
+    const SUCCESS_JSON_DECODE = 0;
+
+    private SlimApp $app;
 
     protected function setUp(): void
     {
-        $this->app = (new App(true))->get();
+        $this->app = (new App(
+            self::API_KEY,
+            $this->createMock(SheetsService::class),
+            self::DEBUG
+        ))->get();
     }
 
-    public function testHandleBase(): void
+    public function testAppIsASlimFrameworkApp(): void
     {
-        $request = RequestFactory::create()->createServerRequestFromGlobals();
-        $request->withMethod("GET");
-        $request->withRequestTarget("/");
+        $this->assertInstanceOf(SlimApp::class, $this->app);
+    }
 
+    public function testPOSTLogsShouldResolve(): void
+    {
+        $request = $this->buildRequest("POST", "/logs");
         $response = $this->app->handle($request);
 
         $this->assertEquals(200, $response->getStatusCode());
     }
+
+    public function testPOSTLogsShouldReturnJSON(): void
+    {
+        $request = $this->buildRequest("POST", "/logs");
+
+        $response = $this->app->handle($request);
+        $jsonString = $response->getBody()->__toString();
+        $json = json_decode($jsonString);
+
+        $this->assertEquals(self::SUCCESS_JSON_DECODE, json_last_error());
+    }
+
+    private function buildRequest(string $method, string $path)
+    {
+        return RequestFactory::create()
+            ->createServerRequestFromGlobals()
+            ->withMethod(strtoupper($method))
+            ->withUri(UriFactory::createUri($path));
+    }
 }
diff --git a/tests/config/ConfigTest.php b/tests/config/ConfigTest.php
new file mode 100644
index 0000000000000000000000000000000000000000..7cf3f0437c607162c0b9d493ed1867e4412b8c82
--- /dev/null
+++ b/tests/config/ConfigTest.php
@@ -0,0 +1,33 @@
+<?php
+declare(strict_types=1);
+
+namespace addianto\LionGame\Backend\Config\Test;
+
+use PHPUnit\Framework\TestCase;
+use Google_Service_Sheets as GoogleSheetsAPI;
+use addianto\LionGame\Backend\Config\Config;
+
+class ConfigTest extends TestCase
+{
+    private array $fixture = array(
+        "applicationCredentials" => __DIR__ . "/example.json",
+    );
+
+    public function testCreateGoogleAPIClient(): void
+    {
+        $client = Config::createGoogleAPIClient("Test App", $this->fixture["applicationCredentials"]);
+
+        $this->assertFileIsReadable($this->fixture["applicationCredentials"]);
+        $this->assertEquals("Test App", $client->getConfig("application_name"));
+        $this->assertEquals(GoogleSheetsAPI::SPREADSHEETS, $client->getScopes()[0]);
+    }
+
+    public function testCreateGoogleSheetsAPI(): void
+    {
+        $api = Config::createGoogleSheetsAPI(
+            Config::createGoogleAPIClient("Test App", $this->fixture["applicationCredentials"])
+        );
+
+        $this->assertInstanceOf(GoogleSheetsAPI::class, $api);
+    }
+}
diff --git a/tests/config/example.json b/tests/config/example.json
new file mode 100644
index 0000000000000000000000000000000000000000..358eca2907b18d85e313f6f586b608191cb95e18
--- /dev/null
+++ b/tests/config/example.json
@@ -0,0 +1,12 @@
+{
+  "type": "service_account",
+  "project_id": "example",
+  "private_key_id": "ffffffffffffffffffffffffffffffffffffffff",
+  "private_key": "-----BEGIN PRIVATE KEY-----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\nzzzzzzzzzzzzzzzzzzzzzzz=\n-----END PRIVATE KEY-----\n",
+  "client_email": "example@example.iam.gserviceaccount.com",
+  "client_id": "000000000000000000000",
+  "auth_uri": "https://accounts.google.com/o/oauth2/auth",
+  "token_uri": "https://oauth2.googleapis.com/token",
+  "auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs",
+  "client_x509_cert_url": "https://www.googleapis.com/robot/v1/metadata/x509/example%40example.iam.gserviceaccount.com"
+}
diff --git a/tests/service/SheetsServiceTest.php b/tests/service/SheetsServiceTest.php
new file mode 100644
index 0000000000000000000000000000000000000000..62f85a863a4492a5f30241e84204c1147e0e6c53
--- /dev/null
+++ b/tests/service/SheetsServiceTest.php
@@ -0,0 +1,34 @@
+<?php
+declare(strict_types=1);
+
+namespace addianto\LionGame\Backend\Service\Test;
+
+use PHPUnit\Framework\TestCase;
+use Google_Service_Sheets as GoogleSheetsAPI;
+use addianto\LionGame\Backend\Service\SheetsService;
+
+class SheetsServiceTest extends TestCase
+{
+    private GoogleSheetsAPI $mockAPI;
+
+    protected function setUp(): void
+    {
+        $this->mockAPI = $this->createMock(GoogleSheetsAPI::class);
+    }
+
+    public function testGetInstance(): void
+    {
+        $this->assertInstanceOf(
+            SheetsService::class,
+            SheetsService::getInstance($this->mockAPI, "12345")
+        );
+    }
+
+    public function testSingletonProperty(): void
+    {
+        $this->assertEquals(
+            SheetsService::getInstance($this->mockAPI, "12345"),
+            SheetsService::getInstance($this->mockAPI, "12345")
+        );
+    }
+}