payload is supported on PHP5.4+

Author: Minishlink

README.md

@@ -7,8 +7,6 @@
 ## Installation
 `composer require minishlink/web-push`
 
-If you have a PHP version smaller than 5.5.9, you will not be able to send any payload.
-
 ## Usage
 WebPush can be used to send notifications to endpoints which server delivers web push notifications as described in 
 the [Web Push protocol](https://tools.ietf.org/html/draft-thomson-webpush-protocol-00).
@@ -175,7 +173,7 @@ using the user public key and authentication secret that you can get by followin
 Internally, WebPush uses the [phpecc](https://github.com/phpecc/phpecc) Elliptic Curve Cryptography library to create 
 local public and private keys and compute the shared secret.
 Then, if you have a PHP >= 7.1, WebPush uses `openssl` in order to encrypt the payload with the encryption key.
-Otherwise, it uses [Spomky-Labs/php-aes-gcm](https://github.com/Spomky-Labs/php-aes-gcm) if you have PHP < 7.1, which is slower.
+Otherwise, if you have PHP < 7.1, it uses [Spomky-Labs/php-aes-gcm](https://github.com/Spomky-Labs/php-aes-gcm), which is slower.
 
 ### How to solve "SSL certificate problem: unable to get local issuer certificate" ?
 Your installation lacks some certificates.

src/WebPush.php

@@ -42,9 +42,6 @@ class WebPush
     /** @var bool Automatic padding of payloads, if disabled, trade security for bandwidth */
     private $automaticPadding = true;
 
-    /** @var boolean */
-    private $payloadEncryptionSupport;
-
     /** @var boolean */
     private $nativePayloadEncryptionSupport;
 
@@ -64,8 +61,7 @@ public function __construct(array $apiKeys = array(), $TTL = 2419200, $timeout =
         $client = isset($client) ? $client : new MultiCurl();
         $client->setTimeout($timeout);
         $this->browser = new Browser($client);
-
-        $this->payloadEncryptionSupport = version_compare(phpversion(), '5.5.9', '>=') && class_exists("\\Jose\\Util\\GCM");
+        
         $this->nativePayloadEncryptionSupport = version_compare(phpversion(), '7.1', '>=');
     }
 
@@ -195,7 +191,7 @@ private function prepareAndSend(array $notifications, $serverType)
             $userPublicKey = $notification->getUserPublicKey();
             $userAuthToken = $notification->getUserAuthToken();
 
-            if (isset($payload) && isset($userPublicKey) && isset($userAuthToken) && ($this->payloadEncryptionSupport || $this->nativePayloadEncryptionSupport)) {
+            if (isset($payload) && isset($userPublicKey) && isset($userAuthToken)) {
                 $encrypted = Encryption::encrypt($payload, $userPublicKey, $userAuthToken, $this->nativePayloadEncryptionSupport);
 
                 $headers = array(