Solution regarding https://github.com/artdarek/oauth-4-laravel/issues/40

LaravelRedisStorage.php

<?php

namespace OAuth\Common\Storage;

use Predis\Client as Predis;

class LaravelRedisStorage extends Redis implements TokenStorageInterface {

    public function __construct()
    {
        $this->redis = \Redis::connection();

        $this->key = 'oauth_user_tokens';
        $this->stateKey = 'oauth_user_states';
        $this->cachedTokens = array();
        $this->cachedStates = array();
    }

}