PayPal V2

<?php

$logins = [
    'login' => $credentials['private']['login'],
    'password' => $credentials['private']['password'],
];

$data = [
    'orderid' => 'POC_PAYPAL_V2_' . rand(),
    'operation' => 'Sale',
    'accept_url' => $FRONDEND_URL . '/?type=accept',
    'decline_url' => $FRONDEND_URL . '/?type=error',
    'cancel_url' => $FRONDEND_URL . '/?type=error',
    'language' => 'fr_FR',
    'custom_data' => '{"item 1":"Large Mocha Latte", "item 2":"Banana Nut Muffin"}',
    // ...
];

try {
    //Get JSON data from front-end
    $receivedData = json_decode(file_get_contents('php://input'), true);

    //Set reponse code  at 200
    http_response_code(200);

    $config = new \HiPay\Fullservice\HTTP\Configuration\Configuration([
        'apiUsername' => $logins['login'],
        'apiPassword' => $logins['password']
    ]);
    $clientProvider = new \HiPay\Fullservice\HTTP\SimpleHTTPClient($config);
    $gatewayClient = new \HiPay\Fullservice\Gateway\Client\GatewayClient($clientProvider);

    //Instantiate order request
    $orderRequest = new \HiPay\Fullservice\Gateway\Request\Order\OrderRequest();
    $orderRequest->orderid = $data['orderid'];
    $orderRequest->operation = $data['operation'];
    $orderRequest->description = $data['description'];
    $orderRequest->long_description = $data['long_description'];
    $orderRequest->accept_url = $data['accept_url'];
    $orderRequest->decline_url = $data['decline_url'];
    $orderRequest->pending_url = $data['pending_url'];
    $orderRequest->exception_url = $data['exception_url'];
    $orderRequest->cancel_url = $data['cancel_url'];
    $orderRequest->notify_url = $data['notify_url'];
    $orderRequest->language = $data['language'];
    $orderRequest->custom_data = $data['custom_data'];
    $orderRequest->payment_product = $receivedData['payment_product'];
    // Set provider_data parameter if the payment method is PayPal and if the frontend sent an orderID parameter
    if ($orderRequest->payment_product === 'paypal' && isset($receivedData['orderID'])) {
        $providerData = ['paypal_id' => $receivedData['orderID']];
        $orderRequest->provider_data = json_encode($providerData);
    }

    //Send the request order
    $transaction = $gatewayClient->requestNewOrder($orderRequest);

    $response = [
        'transaction_number' => $transaction->getTransactionReference(),
        'order_id' => $transaction->getOrder()->getId(),
        'forward_url' => (!$transaction->getReason() ? $data['accept_url'] : $data['cancel_url']),
    ];

    // This response is send to the front-end at the success of AJAX call
    echo json_encode($response);

} catch (\Exception $e) {
    $response = [
        'error_message' => $e->getMessage(),
    ];

    // This response is send to the front-end at the failure of AJAX call
    echo json_encode($response);
}