old code for pagar.me example in L4, to be used as basic example not working (or good) code

pagar.me.php

 composer require "pagarme/pagarme-php:dev-master"
 
 <?PHP
use PagarMe;
use PagarMe_Charge;
use PagarMe_Exception;
use PagarMe_Subscription;
use PagarMe_Transaction;
 class PagarMePayment implements PaymentInterface {
    public static $key;
    public $customer;
    public $plan;
    public $charge;
    public function __construct(){
        if (empty(self::$key)){
            self::$key = getenv('comocode-keys.pagarme.secret');
            PagarMe::setApiKey(self::$key);
        }
    }
    public function customer_id(){
        return $this->customer->id;
    }
    public function plan_id($type){
        return !empty(getenv("comocode-keys.pagarme.{$type}")) ? getenv("comocode-keys.pagarme.{$type}") : false;
    }
    public function charge_id(){
        return $this->charge->id;
    }
    public function isActive(){
        return ($this->plan->getStatus() !== 'canceled');
    }
    public function create_a_customer($token, User $user){
        $this->customer = new PagarMe_Transaction([
                "card_hash" => $token,
                'customer'=>[
                    'name' => $user->name,
                    'document_number' => $user->id,
                    'email' => $user->email
                ]
            ]
        );
        dd(['customer',$this->customer->getCustomer()]);
    }
    public function subscribe_a_customer(Subscription $subscription, User $user,  $token){
        $plan_id = $this->plan_id($subscription->name);
        if (empty($plan_id)) {
            return false;
        }
        $this->plan  = new \PagarMe_Subscription([
            "card_hash" => $token,
            "plan_id"=>$plan_id,
            'customer'=>[
                'name' => $user->name,
                'email' => $user->email
            ]
        ]);
        try {
            $this->plan->create();
        }
        catch(PagarMe_Exception $e){
            throw new GeneralException($e->getMessage());
        }
        $this->customer=$this->plan->getCustomer();
        $this->charge=$this->plan;
    }
    public function charge_a_customer(Subscription $subscription, Customer $customer){
    }
    public function cancel_a_subscription(Customer $customer, Charge $charge){
        try {
            $this->plan =  PagarMe_Subscription::findById($charge->charge_id);
            $this->plan->cancel(); // Cancel
        }
        catch(PagarMe_Exception $e){
            throw new GeneralException($e->getMessage());
        }
    }
}