Omnipay Paypal Express Command

MakePayment.php

<?php

namespace App\Commands;

use App\Commands\Command;
use Dotenv;
use Illuminate\Contracts\Bus\SelfHandling;
use Omnipay\PayPal\ExpressGateway;

class MakePayment extends Command implements SelfHandling
{
    protected $cancelUrl;
    protected $returnUrl;
    protected $description;
    protected $currency;
    protected $items;

    /**
     * @param array $items
     * @param string $currency
     * @param string $cancelUrl
     * @param string $returnUrl
     */
    public function __construct(array $items, $currency, $cancelUrl, $returnUrl)
    {
        $this->items = $items;
        $this->currency = $currency;
        $this->cancelUrl = $cancelUrl;
        $this->returnUrl = $returnUrl;
    }

    /**
     * @param Dotenv $environmentVariables
     * @param ExpressGateway $gateway
     */
    public function handle(Dotenv $environmentVariables, ExpressGateway $gateway)
    {
        /** @var \Omnipay\PayPal\ExpressGateway $gateway */
        $gateway->setUsername($environmentVariables->findEnvironmentVariable('PAYPAL_USERNAME'));
        $gateway->setPassword($environmentVariables->findEnvironmentVariable('PAYPAL_PASSWORD'));
        $gateway->setSignature($environmentVariables->findEnvironmentVariable('PAYPAL_SIGNATURE'));

        if($environmentVariables->findEnvironmentVariable('PAYPAL_TEST_MODE') === "true") {
            $gateway->setTestMode(true);
        }

        $response = $gateway->purchase($this->details())->send();
        if ($response->isRedirect()) {
            // redirect to offsite payment gateway
            $response->redirect();
        } else {
            // payment failed: display message to customer
            echo $response->getMessage();
            echo $response->getTransactionReference();
        }

    }

    /**
     * @param array $items
     *
     * @return float
     */
    private function getSumTotal(array $items)
    {
        return array_reduce($items, function ($current, $item) {
            return $current + ($item['price'] * $item['quantity']);
        }, 0);
    }

    /**
     * @return array
     */
    private function details()
    {
        return [
            'amount' => $this->getSumTotal($this->items),
            'cancelUrl' => $this->cancelUrl,
            'returnUrl' => $this->returnUrl,
            'currency' => $this->currency,
            'items' => $this->items
        ];
    }
}