ticketbeast/app/Billing/StripePaymentGateway.php

<?php

namespace App\Billing;

use Stripe\Charge;
use Stripe\Error\InvalidRequest;

class StripePaymentGateway implements PaymentGateway
{
    private $apiKey;

    public function __construct($apiKey)
    {
        $this->apiKey = $apiKey;
    }

    public function charge($amount, $token)
    {
        try {
            Charge::create([
                'amount' => $amount,
                'source' => $token,
                'currency' => 'usd',
            ], ['api_key' => $this->apiKey]);
        } catch (InvalidRequest $e) {
            throw new PaymentFailedException;
        }
    }

    public function getValidTestToken()
    {
        return \Stripe\Token::create([
            "card" => [
                "number" => "4242424242424242",
                "exp_month" => 1,
                "exp_year" => date('Y') + 1,
                "cvc" => "123"
            ]
        ], ['api_key' => $this->apiKey])->id;
    }
}