diff --git a/.scrutinizer.yml b/.scrutinizer.yml
new file mode 100644
index 0000000..ada08ac
--- /dev/null
+++ b/.scrutinizer.yml
@@ -0,0 +1,3 @@
+tools:
+    external_code_coverage:
+        timeout: 600    # Timeout in seconds.
\ No newline at end of file
diff --git a/.travis.yml b/.travis.yml
index 4461be2..a61a7ed 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,6 +3,7 @@ language: php
 sudo: false
 
 php:
+  - 5.6
   - 7.0
   - 7.1
   - 7.2
diff --git a/composer.json b/composer.json
index 715a3b7..2ce6c92 100644
--- a/composer.json
+++ b/composer.json
@@ -16,11 +16,11 @@
         "psr-4": { "BernardoSilva\\JWTAPIClient\\Tests\\": "tests/" }
     },
     "require": {
-        "php": ">=7.0",
+        "php": ">=5.6",
         "guzzlehttp/guzzle": "^6.3"
     },
     "require-dev": {
         "bernardosilva/git-hooks-php": "^2.0",
-        "phpunit/phpunit": "^6.5"
+        "phpunit/phpunit": "^5.7|^6.5"
     }
 }
diff --git a/composer.lock b/composer.lock
deleted file mode 100644
index 1cab863..0000000
--- a/composer.lock
+++ /dev/null
@@ -1,1892 +0,0 @@
-{
-    "_readme": [
-        "This file locks the dependencies of your project to a known state",
-        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
-        "This file is @generated automatically"
-    ],
-    "content-hash": "131487e4a5c2b44a49a4b77ef89e6eb1",
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-            "version": "6.3.0",
-            "source": {
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-                "url": "https://github.com/guzzle/guzzle.git",
-                "reference": "f4db5a78a5ea468d4831de7f0bf9d9415e348699"
-            },
-            "dist": {
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-                "url": "https://api.github.com/repos/guzzle/guzzle/zipball/f4db5a78a5ea468d4831de7f0bf9d9415e348699",
-                "reference": "f4db5a78a5ea468d4831de7f0bf9d9415e348699",
-                "shasum": ""
-            },
-            "require": {
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-                "guzzlehttp/psr7": "^1.4",
-                "php": ">=5.5"
-            },
-            "require-dev": {
-                "ext-curl": "*",
-                "phpunit/phpunit": "^4.0 || ^5.0",
-                "psr/log": "^1.0"
-            },
-            "suggest": {
-                "psr/log": "Required for using the Log middleware"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "6.2-dev"
-                }
-            },
-            "autoload": {
-                "files": [
-                    "src/functions_include.php"
-                ],
-                "psr-4": {
-                    "GuzzleHttp\\": "src/"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Michael Dowling",
-                    "email": "mtdowling@gmail.com",
-                    "homepage": "https://github.com/mtdowling"
-                }
-            ],
-            "description": "Guzzle is a PHP HTTP client library",
-            "homepage": "http://guzzlephp.org/",
-            "keywords": [
-                "client",
-                "curl",
-                "framework",
-                "http",
-                "http client",
-                "rest",
-                "web service"
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-            "time": "2017-06-22T18:50:49+00:00"
-        },
-        {
-            "name": "guzzlehttp/promises",
-            "version": "v1.3.1",
-            "source": {
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-                "url": "https://github.com/guzzle/promises.git",
-                "reference": "a59da6cf61d80060647ff4d3eb2c03a2bc694646"
-            },
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-                "shasum": ""
-            },
-            "require": {
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-            },
-            "require-dev": {
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-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
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-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "GuzzleHttp\\Promise\\": "src/"
-                },
-                "files": [
-                    "src/functions_include.php"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
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-                    "email": "mtdowling@gmail.com",
-                    "homepage": "https://github.com/mtdowling"
-                }
-            ],
-            "description": "Guzzle promises library",
-            "keywords": [
-                "promise"
-            ],
-            "time": "2016-12-20T10:07:11+00:00"
-        },
-        {
-            "name": "guzzlehttp/psr7",
-            "version": "1.4.2",
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-                "reference": "f5b8a8512e2b58b0071a7280e39f14f72e05d87c"
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-                "shasum": ""
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-                "psr/http-message": "~1.0"
-            },
-            "provide": {
-                "psr/http-message-implementation": "1.0"
-            },
-            "require-dev": {
-                "phpunit/phpunit": "~4.0"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
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-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "GuzzleHttp\\Psr7\\": "src/"
-                },
-                "files": [
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-                ]
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-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
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-                    "homepage": "https://github.com/mtdowling"
-                },
-                {
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-                    "homepage": "https://github.com/Tobion"
-                }
-            ],
-            "description": "PSR-7 message implementation that also provides common utility methods",
-            "keywords": [
-                "http",
-                "message",
-                "request",
-                "response",
-                "stream",
-                "uri",
-                "url"
-            ],
-            "time": "2017-03-20T17:10:46+00:00"
-        },
-        {
-            "name": "psr/http-message",
-            "version": "1.0.1",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/php-fig/http-message.git",
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-                "shasum": ""
-            },
-            "require": {
-                "php": ">=5.3.0"
-            },
-            "type": "library",
-            "extra": {
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-                    "dev-master": "1.0.x-dev"
-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "Psr\\Http\\Message\\": "src/"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "PHP-FIG",
-                    "homepage": "http://www.php-fig.org/"
-                }
-            ],
-            "description": "Common interface for HTTP messages",
-            "homepage": "https://github.com/php-fig/http-message",
-            "keywords": [
-                "http",
-                "http-message",
-                "psr",
-                "psr-7",
-                "request",
-                "response"
-            ],
-            "time": "2016-08-06T14:39:51+00:00"
-        }
-    ],
-    "packages-dev": [
-        {
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-            "version": "1.2.1",
-            "source": {
-                "type": "git",
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-            "dist": {
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-                }
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-        },
-        {
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-            "version": "2.1.1",
-            "source": {
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-                "url": "https://github.com/BernardoSilva/git-hooks-php.git",
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-                "shasum": ""
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-            },
-            "type": "git-hook",
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
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-            ],
-            "authors": [
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-                    "name": "Bernardo Silva",
-                    "email": "benny.stuff@gmail.com"
-                }
-            ],
-            "description": "Composer git-hook package with hooks for your php projects.",
-            "keywords": [
-                "checkstyle",
-                "git",
-                "hooks",
-                "php-cs-fixer",
-                "pre-commit"
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-        },
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-            "homepage": "https://github.com/doctrine/instantiator",
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-                "instantiate"
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-                "copy",
-                "duplicate",
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-                "object graph"
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-            "time": "2017-10-19T19:58:43+00:00"
-        },
-        {
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-            "description": "Component for reading phar.io manifest information from a PHP Archive (PHAR)",
-            "time": "2017-03-05T18:14:27+00:00"
-        },
-        {
-            "name": "phar-io/version",
-            "version": "1.0.1",
-            "source": {
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diff --git a/src/APIClient.php b/src/APIClient.php
index 915cfc9..5fff6b9 100644
--- a/src/APIClient.php
+++ b/src/APIClient.php
@@ -44,7 +44,7 @@ class APIClient
      * @param string $baseURI
      * @param ApiCredentials $credentials
      */
-    public function __construct(string $baseURI, ApiCredentials $credentials)
+    public function __construct($baseURI, ApiCredentials $credentials)
     {
         $this->setBaseURI($baseURI);
         $this->setCredentials($credentials);
@@ -55,7 +55,7 @@ public function __construct(string $baseURI, ApiCredentials $credentials)
      * @param array $options
      * @return \Psr\Http\Message\ResponseInterface
      */
-    public function get(string $uri, array $options = [])
+    public function get($uri, array $options = [])
     {
         return $this->getClient()->get($uri, $options);
     }
@@ -65,7 +65,7 @@ public function get(string $uri, array $options = [])
      * @param $options
      * @return \Psr\Http\Message\ResponseInterface
      */
-    public function delete(string $uri, $options)
+    public function delete($uri, $options)
     {
         return $this->getClient()->delete($uri, $options);
     }
@@ -75,7 +75,7 @@ public function delete(string $uri, $options)
      * @param array $options
      * @return \Psr\Http\Message\ResponseInterface
      */
-    public function patch(string $uri, array $options = [])
+    public function patch($uri, array $options = [])
     {
         return $this->getClient()->patch($uri, $options);
     }
@@ -85,7 +85,7 @@ public function patch(string $uri, array $options = [])
      * @param array $options
      * @return \Psr\Http\Message\ResponseInterface
      */
-    public function post(string $uri, array $options = [])
+    public function post($uri, array $options = [])
     {
         return $this->getClient()->post($uri, $options);
     }
@@ -95,7 +95,7 @@ public function post(string $uri, array $options = [])
      * @param array $options
      * @return \Psr\Http\Message\ResponseInterface
      */
-    public function put(string $uri, array $options = [])
+    public function put($uri, array $options = [])
     {
         return $this->getClient()->put($uri, $options);
     }
@@ -211,7 +211,7 @@ public function getBaseURI()
     /**
      * @param string $baseURI
      */
-    private function setBaseURI(string $baseURI)
+    private function setBaseURI($baseURI)
     {
         $this->baseURI = $baseURI;
     }
@@ -227,7 +227,7 @@ public function getKey()
     /**
      * @param string $key
      */
-    private function setKey(string $key)
+    private function setKey($key)
     {
         $this->key = $key;
     }
@@ -243,7 +243,7 @@ public function getSecret()
     /**
      * @param string $secret
      */
-    private function setSecret(string $secret)
+    private function setSecret($secret)
     {
         $this->secret = $secret;
     }
diff --git a/src/AccessTokenCredentials.php b/src/AccessTokenCredentials.php
index c80f892..68c8f00 100644
--- a/src/AccessTokenCredentials.php
+++ b/src/AccessTokenCredentials.php
@@ -13,7 +13,7 @@ final class AccessTokenCredentials implements ApiCredentials
      * AccessTokenCredentials constructor.
      * @param string $accessToken
      */
-    public function __construct(string $accessToken)
+    public function __construct($accessToken)
     {
         $this->setAccessToken($accessToken);
     }
@@ -21,7 +21,7 @@ public function __construct(string $accessToken)
     /**
      * @return string
      */
-    public function getAccessToken(): string
+    public function getAccessToken()
     {
         return $this->accessToken;
     }
@@ -29,7 +29,7 @@ public function getAccessToken(): string
     /**
      * @param string $accessToken
      */
-    public function setAccessToken(string $accessToken)
+    public function setAccessToken($accessToken)
     {
         $this->accessToken = $accessToken;
     }
diff --git a/src/UsernameAndPasswordCredentials.php b/src/UsernameAndPasswordCredentials.php
index 49ac1a0..89bd520 100644
--- a/src/UsernameAndPasswordCredentials.php
+++ b/src/UsernameAndPasswordCredentials.php
@@ -19,7 +19,7 @@ final class UsernameAndPasswordCredentials implements ApiCredentials
      * @param string $username
      * @param string $password
      */
-    public function __construct(string $username, string $password)
+    public function __construct($username, $password)
     {
         $this->setUsername($username);
         $this->setPassword($password);
@@ -28,7 +28,7 @@ public function __construct(string $username, string $password)
     /**
      * @return string
      */
-    public function getUsername(): string
+    public function getUsername()
     {
         return $this->username;
     }
@@ -36,7 +36,7 @@ public function getUsername(): string
     /**
      * @param string $username
      */
-    public function setUsername(string $username)
+    public function setUsername($username)
     {
         $this->username = $username;
     }
@@ -44,7 +44,7 @@ public function setUsername(string $username)
     /**
      * @return string
      */
-    public function getPassword(): string
+    public function getPassword()
     {
         return $this->password;
     }
@@ -52,7 +52,7 @@ public function getPassword(): string
     /**
      * @param string $password
      */
-    public function setPassword(string $password)
+    public function setPassword($password)
     {
         $this->password = $password;
     }