diff --git a/composer.json b/composer.json
index 14d1923..f3834fb 100644
--- a/composer.json
+++ b/composer.json
@@ -24,8 +24,8 @@
         "phing/phing": "2.*"
     },
     "autoload": {
-        "psr-0": {
-            "Esendex": "src/"
+        "psr-4": {
+            "Esendex\\": "src/"
         }
     }
 }
diff --git a/composer.lock b/composer.lock
index 36f4de2..684c48a 100644
--- a/composer.lock
+++ b/composer.lock
@@ -1,42 +1,40 @@
 {
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         "This file locks the dependencies of your project to a known state",
-        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "hash": "26c6633bb716651ce409d31285e4f76a",
+    "content-hash": "2971f54d7a3d6cb237719624f564582b",
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     "packages-dev": [
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-            "version": "1.0.5",
+            "version": "1.5.0",
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-                "reference": "8e884e78f9f0eb1329e445619e04456e64d8051d"
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+                "php": "^7.1 || ^8.0"
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-                "athletic/athletic": "~0.1.8",
+                "doctrine/coding-standard": "^9 || ^11",
                 "ext-pdo": "*",
                 "ext-phar": "*",
-                "phpunit/phpunit": "~4.0",
-                "squizlabs/php_codesniffer": "~2.0"
+                "phpbench/phpbench": "^0.16 || ^1",
+                "phpstan/phpstan": "^1.4",
+                "phpstan/phpstan-phpunit": "^1",
+                "phpunit/phpunit": "^7.5 || ^8.5 || ^9.5",
+                "vimeo/psalm": "^4.30 || ^5.4"
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@@ -50,29 +48,47 @@
                 {
                     "name": "Marco Pivetta",
                     "email": "ocramius@gmail.com",
-                    "homepage": "http://ocramius.github.com/"
+                    "homepage": "https://ocramius.github.io/"
                 }
             ],
             "description": "A small, lightweight utility to instantiate objects in PHP without invoking their constructors",
-            "homepage": "https://github.com/doctrine/instantiator",
+            "homepage": "https://www.doctrine-project.org/projects/instantiator.html",
             "keywords": [
                 "constructor",
                 "instantiate"
             ],
-            "time": "2015-06-14 21:17:01"
+            "support": {
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+                "source": "https://github.com/doctrine/instantiator/tree/1.5.0"
+            },
+            "funding": [
+                {
+                    "url": "https://www.doctrine-project.org/sponsorship.html",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://www.patreon.com/phpdoctrine",
+                    "type": "patreon"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/doctrine%2Finstantiator",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2022-12-30T00:15:36+00:00"
         },
         {
             "name": "phing/phing",
-            "version": "2.11.0",
+            "version": "2.17.4",
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                 "url": "https://github.com/phingofficial/phing.git",
-                "reference": "a185fef6df7241e540466b67486a4c4b552260e1"
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@@ -80,22 +96,24 @@
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-                "lastcraft/simpletest": "@dev",
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                 "pdepend/pdepend": "2.x",
-                "pear-pear.php.net/http_request2": "2.2.x",
-                "pear-pear.php.net/net_growl": "2.7.x",
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-                "pear-pear.php.net/pear_packagefilemanager2": "1.0.x",
-                "pear-pear.php.net/xml_serializer": "0.20.x",
-                "pear/pear_exception": "~1.0",
+                "pear/archive_tar": "1.4.x",
+                "pear/http_request2": "dev-trunk",
+                "pear/net_growl": "dev-trunk",
+                "pear/pear-core-minimal": "1.10.1",
                 "pear/versioncontrol_git": "@dev",
                 "pear/versioncontrol_svn": "~0.5",
                 "phpdocumentor/phpdocumentor": "2.x",
-                "phploc/phploc": "2.x",
+                "phploc/phploc": "~2.0.6",
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                 "phpunit/phpunit": ">=3.7",
+                "sebastian/git": "~1.0",
                 "sebastian/phpcpd": "2.x",
-                "squizlabs/php_codesniffer": "~2.2"
+                "siad007/versioncontrol_hg": "^1.0",
+                "simpletest/simpletest": "^1.1",
+                "squizlabs/php_codesniffer": "~2.2",
+                "symfony/yaml": "^2.8 || ^3.1 || ^4.0"
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@@ -108,6 +126,7 @@
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                 "phpunit/phpunit": "The PHP Unit Testing Framework",
                 "sebastian/phpcpd": "Copy/Paste Detector (CPD) for PHP code",
+                "siad007/versioncontrol_hg": "A library for interfacing with Mercurial repositories.",
                 "tedivm/jshrink": "Javascript Minifier built in PHP"
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@@ -116,7 +135,7 @@
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+                    "dev-master": "2.16.x-dev"
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@@ -129,7 +148,7 @@
                 "classes"
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-                "LGPL-3.0"
+                "LGPL-3.0-only"
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                 {
@@ -149,20 +168,39 @@
                 "task",
                 "tool"
             ],
-            "time": "2015-05-20 13:04:38"
+            "support": {
+                "irc": "irc://irc.freenode.net/phing",
+                "issues": "https://www.phing.info/trac/report",
+                "source": "https://github.com/phingofficial/phing/tree/2.17.4"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/mrook",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/siad007",
+                    "type": "github"
+                },
+                {
+                    "url": "https://www.patreon.com/michielrook",
+                    "type": "patreon"
+                }
+            ],
+            "time": "2022-07-08T09:07:07+00:00"
         },
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-            "version": "2.1.9",
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-                "reference": "5bd48b86cd282da411bb80baac1398ce3fefac41"
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                 "phpunit/php-token-stream": "~1.3",
-                "sebastian/environment": "~1.0",
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@@ -185,7 +223,7 @@
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@@ -211,7 +249,12 @@
                 "testing",
                 "xunit"
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+            "support": {
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+                "issues": "https://github.com/sebastianbergmann/php-code-coverage/issues",
+                "source": "https://github.com/sebastianbergmann/php-code-coverage/tree/2.2"
+            },
+            "time": "2015-10-06T15:47:00+00:00"
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@@ -256,7 +299,12 @@
                 "filesystem",
                 "iterator"
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-            "time": "2013-10-10 15:34:57"
+            "support": {
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+                "issues": "https://github.com/sebastianbergmann/php-file-iterator/issues",
+                "source": "https://github.com/sebastianbergmann/php-file-iterator/tree/1.3.4"
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@@ -297,25 +345,32 @@
             "keywords": [
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-            "time": "2015-06-21 13:50:34"
+            "support": {
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-            "version": "1.0.7",
+            "version": "1.0.8",
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@@ -338,20 +393,25 @@
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                 "timer"
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+            "support": {
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+                "source": "https://github.com/sebastianbergmann/php-timer/tree/master"
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@@ -387,7 +447,12 @@
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+            "support": {
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+                "source": "https://github.com/sebastianbergmann/php-token-stream/tree/1.4"
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+            "time": "2017-12-04T08:55:13+00:00"
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@@ -461,24 +526,29 @@
                 "testing",
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-            "time": "2014-11-11 10:11:09"
+            "support": {
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+                "source": "https://github.com/sebastianbergmann/phpunit/tree/4.3"
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-            "version": "2.3.6",
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@@ -517,26 +587,32 @@
                 "mock",
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-            "time": "2015-07-10 06:54:24"
+            "support": {
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+                "source": "https://github.com/sebastianbergmann/phpunit-mock-objects/tree/2.3"
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                 "url": "https://github.com/sebastianbergmann/comparator.git",
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@@ -581,32 +657,36 @@
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-            "time": "2015-07-26 15:48:44"
+            "support": {
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@@ -629,24 +709,28 @@
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-            "homepage": "http://www.github.com/sebastianbergmann/diff",
+            "homepage": "https://github.com/sebastianbergmann/diff",
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+            "support": {
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+                "source": "https://github.com/sebastianbergmann/diff/tree/master"
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@@ -683,20 +767,24 @@
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                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/exporter.git",
-                "reference": "7ae5513327cb536431847bcc0c10edba2701064e"
+                "reference": "42c4c2eec485ee3e159ec9884f95b431287edde4"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/exporter/zipball/7ae5513327cb536431847bcc0c10edba2701064e",
-                "reference": "7ae5513327cb536431847bcc0c10edba2701064e",
+                "url": "https://api.github.com/repos/sebastianbergmann/exporter/zipball/42c4c2eec485ee3e159ec9884f95b431287edde4",
+                "reference": "42c4c2eec485ee3e159ec9884f95b431287edde4",
                 "shasum": ""
             },
             "require": {
@@ -704,12 +792,13 @@
                 "sebastian/recursion-context": "~1.0"
             },
             "require-dev": {
+                "ext-mbstring": "*",
                 "phpunit/phpunit": "~4.4"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.2.x-dev"
+                    "dev-master": "1.3.x-dev"
                 }
             },
             "autoload": {
@@ -749,20 +838,24 @@
                 "export",
                 "exporter"
             ],
-            "time": "2015-06-21 07:55:53"
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/exporter/issues",
+                "source": "https://github.com/sebastianbergmann/exporter/tree/master"
+            },
+            "time": "2016-06-17T09:04:28+00:00"
         },
         {
             "name": "sebastian/recursion-context",
-            "version": "1.0.1",
+            "version": "1.0.5",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/recursion-context.git",
-                "reference": "994d4a811bafe801fb06dccbee797863ba2792ba"
+                "reference": "b19cc3298482a335a95f3016d2f8a6950f0fbcd7"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/recursion-context/zipball/994d4a811bafe801fb06dccbee797863ba2792ba",
-                "reference": "994d4a811bafe801fb06dccbee797863ba2792ba",
+                "url": "https://api.github.com/repos/sebastianbergmann/recursion-context/zipball/b19cc3298482a335a95f3016d2f8a6950f0fbcd7",
+                "reference": "b19cc3298482a335a95f3016d2f8a6950f0fbcd7",
                 "shasum": ""
             },
             "require": {
@@ -802,7 +895,11 @@
             ],
             "description": "Provides functionality to recursively process PHP variables",
             "homepage": "http://www.github.com/sebastianbergmann/recursion-context",
-            "time": "2015-06-21 08:04:50"
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/recursion-context/issues",
+                "source": "https://github.com/sebastianbergmann/recursion-context/tree/master"
+            },
+            "time": "2016-10-03T07:41:43+00:00"
         },
         {
             "name": "sebastian/version",
@@ -837,43 +934,130 @@
             ],
             "description": "Library that helps with managing the version number of Git-hosted PHP projects",
             "homepage": "https://github.com/sebastianbergmann/version",
-            "time": "2015-06-21 13:59:46"
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/version/issues",
+                "source": "https://github.com/sebastianbergmann/version/tree/1.0.6"
+            },
+            "time": "2015-06-21T13:59:46+00:00"
         },
         {
-            "name": "symfony/yaml",
-            "version": "v2.7.2",
+            "name": "symfony/polyfill-ctype",
+            "version": "v1.27.0",
             "source": {
                 "type": "git",
-                "url": "https://github.com/symfony/Yaml.git",
-                "reference": "4bfbe0ed3909bfddd75b70c094391ec1f142f860"
+                "url": "https://github.com/symfony/polyfill-ctype.git",
+                "reference": "5bbc823adecdae860bb64756d639ecfec17b050a"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/Yaml/zipball/4bfbe0ed3909bfddd75b70c094391ec1f142f860",
-                "reference": "4bfbe0ed3909bfddd75b70c094391ec1f142f860",
+                "url": "https://api.github.com/repos/symfony/polyfill-ctype/zipball/5bbc823adecdae860bb64756d639ecfec17b050a",
+                "reference": "5bbc823adecdae860bb64756d639ecfec17b050a",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.3.9"
+                "php": ">=7.1"
             },
-            "require-dev": {
-                "symfony/phpunit-bridge": "~2.7"
+            "provide": {
+                "ext-ctype": "*"
+            },
+            "suggest": {
+                "ext-ctype": "For best performance"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.7-dev"
+                    "dev-main": "1.27-dev"
+                },
+                "thanks": {
+                    "name": "symfony/polyfill",
+                    "url": "https://github.com/symfony/polyfill"
                 }
             },
             "autoload": {
+                "files": [
+                    "bootstrap.php"
+                ],
                 "psr-4": {
-                    "Symfony\\Component\\Yaml\\": ""
+                    "Symfony\\Polyfill\\Ctype\\": ""
                 }
             },
             "notification-url": "https://packagist.org/downloads/",
             "license": [
                 "MIT"
             ],
+            "authors": [
+                {
+                    "name": "Gert de Pagter",
+                    "email": "BackEndTea@gmail.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Symfony polyfill for ctype functions",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "compatibility",
+                "ctype",
+                "polyfill",
+                "portable"
+            ],
+            "support": {
+                "source": "https://github.com/symfony/polyfill-ctype/tree/v1.27.0"
+            },
+            "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": "2022-11-03T14:55:06+00:00"
+        },
+        {
+            "name": "symfony/yaml",
+            "version": "v2.8.52",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/yaml.git",
+                "reference": "02c1859112aa779d9ab394ae4f3381911d84052b"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/yaml/zipball/02c1859112aa779d9ab394ae4f3381911d84052b",
+                "reference": "02c1859112aa779d9ab394ae4f3381911d84052b",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.9",
+                "symfony/polyfill-ctype": "~1.8"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.8-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Symfony\\Component\\Yaml\\": ""
+                },
+                "exclude-from-classmap": [
+                    "/Tests/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
             "authors": [
                 {
                     "name": "Fabien Potencier",
@@ -886,7 +1070,10 @@
             ],
             "description": "Symfony Yaml Component",
             "homepage": "https://symfony.com",
-            "time": "2015-07-01 11:25:50"
+            "support": {
+                "source": "https://github.com/symfony/yaml/tree/v2.8.52"
+            },
+            "time": "2018-11-11T11:18:13+00:00"
         }
     ],
     "aliases": [],
@@ -898,5 +1085,6 @@
         "php": ">=5.3",
         "ext-curl": "*"
     },
-    "platform-dev": []
+    "platform-dev": [],
+    "plugin-api-version": "2.3.0"
 }
diff --git a/src/Esendex/Http/HttpClient.php b/src/Esendex/Http/HttpClient.php
index c8a47b6..26c20e8 100644
--- a/src/Esendex/Http/HttpClient.php
+++ b/src/Esendex/Http/HttpClient.php
@@ -127,7 +127,7 @@ private function request($url, $authentication, $method, $data = null, $contentT
             if (strlen($data) == 0) {
                 $httpHeaders[] = 'Content-Length: 0';
             }
-            $httpHeaders[] = "Content-Type: ${contentType}; charset=utf-8";
+            $httpHeaders[] = "Content-Type: {$contentType}; charset=utf-8";
         }
         \curl_setopt($curlHandle, CURLOPT_HTTPHEADER, $httpHeaders);
 
diff --git a/src/autoload.php b/src/autoload.php
index 8fb9d73..89bf782 100644
--- a/src/autoload.php
+++ b/src/autoload.php
@@ -36,7 +36,7 @@
 
 define('ESENDEX_HOME', dirname(__FILE__));
 
-class AutoLoader
+class AutoLoad
 {
     const SPLIT_DIR = DIRECTORY_SEPARATOR;
     const SPLIT_NS = '\\';
@@ -55,4 +55,4 @@ public static function load($class)
     }
 }
 
-\spl_autoload_register(array('\Esendex\AutoLoader', 'load'));
+\spl_autoload_register(array('\Esendex\AutoLoad', 'load'));