fix cache, log

composer.json

@@ -14,7 +14,9 @@
         "ext-curl": "*",
         "guzzle/guzzle": "~3.7",
         "jms/serializer": "~0.12 || ~1.4.2",
-        "symfony/validator": "2.8.*"
+        "symfony/validator": "2.8.*",
+        "doctrine/cache": "1.7.*",
+        "psr/log": "~1.0"
     },
     "require-dev": {
         "phpunit/phpunit": "7.1."

composer.lock

@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
         "This file is @generated automatically"
     ],
-    "content-hash": "464b4746b38f4b99a1f77d9f83b80d98",
+    "content-hash": "65e87bbd3abc4686d9a808a71306071a",
     "packages": [
         {
             "name": "doctrine/annotations",
@@ -74,6 +74,80 @@
             ],
             "time": "2017-12-06T07:11:42+00:00"
         },
+        {
+            "name": "doctrine/cache",
+            "version": "v1.7.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/doctrine/cache.git",
+                "reference": "b3217d58609e9c8e661cd41357a54d926c4a2a1a"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/doctrine/cache/zipball/b3217d58609e9c8e661cd41357a54d926c4a2a1a",
+                "reference": "b3217d58609e9c8e661cd41357a54d926c4a2a1a",
+                "shasum": ""
+            },
+            "require": {
+                "php": "~7.1"
+            },
+            "conflict": {
+                "doctrine/common": ">2.2,<2.4"
+            },
+            "require-dev": {
+                "alcaeus/mongo-php-adapter": "^1.1",
+                "mongodb/mongodb": "^1.1",
+                "phpunit/phpunit": "^5.7",
+                "predis/predis": "~1.0"
+            },
+            "suggest": {
+                "alcaeus/mongo-php-adapter": "Required to use legacy MongoDB driver"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.7.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Doctrine\\Common\\Cache\\": "lib/Doctrine/Common/Cache"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Roman Borschel",
+                    "email": "roman@code-factory.org"
+                },
+                {
+                    "name": "Benjamin Eberlei",
+                    "email": "kontakt@beberlei.de"
+                },
+                {
+                    "name": "Guilherme Blanco",
+                    "email": "guilhermeblanco@gmail.com"
+                },
+                {
+                    "name": "Jonathan Wage",
+                    "email": "jonwage@gmail.com"
+                },
+                {
+                    "name": "Johannes Schmitt",
+                    "email": "schmittjoh@gmail.com"
+                }
+            ],
+            "description": "Caching library offering an object-oriented API for many cache backends",
+            "homepage": "http://www.doctrine-project.org",
+            "keywords": [
+                "cache",
+                "caching"
+            ],
+            "time": "2017-08-25T07:02:50+00:00"
+        },
         {
             "name": "doctrine/instantiator",
             "version": "1.1.0",
@@ -537,6 +611,53 @@
             ],
             "time": "2015-07-25T16:39:46+00:00"
         },
+        {
+            "name": "psr/log",
+            "version": "1.0.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/php-fig/log.git",
+                "reference": "4ebe3a8bf773a19edfe0a84b6585ba3d401b724d"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/php-fig/log/zipball/4ebe3a8bf773a19edfe0a84b6585ba3d401b724d",
+                "reference": "4ebe3a8bf773a19edfe0a84b6585ba3d401b724d",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.0.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Psr\\Log\\": "Psr/Log/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "PHP-FIG",
+                    "homepage": "http://www.php-fig.org/"
+                }
+            ],
+            "description": "Common interface for logging libraries",
+            "homepage": "https://github.com/php-fig/log",
+            "keywords": [
+                "log",
+                "psr",
+                "psr-3"
+            ],
+            "time": "2016-10-10T12:19:37+00:00"
+        },
         {
             "name": "symfony/event-dispatcher",
             "version": "v2.8.41",

src/AtolOnlineClient/AtolOnlineApi.php

@@ -159,7 +159,16 @@ class AtolOnlineApi
     }
 
     /**
-     * @return mixed
+     * @return string
+     */
+    public function getVersion(): string
+    {
+        return $this->version;
+    }
+
+    /**
+     * @return bool|mixed
+     * @throws \Exception
      */
     protected function getToken()
     {