$apiKey    = 'Your api key here';

$config       = new Config(Environment::Sandbox, $apiKey, ApiVersion::v1);
$inxyPayments = new INXYPayments($config);

$orderAmountInUSD = 20;
$orderName        = 'Order #1';
$customer         = new Customer('[email protected]', 'John', 'Doe');
$sessionRequest   = new SessionRequest($orderAmountInUSD, $orderName);

$sessionRequest->setOrderId('order_123');
$sessionRequest->setCryptocurrencies([CurrencyCode::USDT, CurrencyCode::BTC]);
$sessionRequest->setPostbackUrl('https://example.com/postback');
$sessionRequest->setCancelUrl('https://example.com/cancel');
$sessionRequest->setSuccessUrl('https://example.com/success');
$sessionRequest->setCustomer($customer);

$sessionResponse = $inxyPayments->createSession($sessionRequest);

header( 'Location: ' . $sessionResponse->getRedirectUri());

function handleWebhooks($request) {
    $secretKey  = 'Your secret key here';
    $validator  = new Validator($secretKey);
    $signedHash = $request->headers['X-INXY-Payments-Signature'];

    $payload = $request->getBody()->getContents(); // fetch json from your request

    if (!$validator->isValid($payload, $signedHash)) {
        throw new BadRequestException('No valid webhook');
    }

    $data = json_decode($payload, false);

    switch ($data->name) {
        case EventName::PaymentsInit:
            handlePaymentsInitWebhook($data);
            break;
        case EventName::PaymentsWaitingConfirmations:
            handlePaymentsWaitingConfirmationsWebhook($data);
            break;
        case EventName::PaymentsReceived:
            handlePaymentsReceivedWebhook($data);
            break;
        default:
            throw new InvalidArgumentException('Undefined webhook name');
    }
}

function handlePaymentsInitWebhook(stdClass $webhookData) {
    $webhook = PaymentsInitWebhookFactory::create($webhookData);

    if ($webhook->data->paymentIntent->status === PaymentIntentStatus::WaitingPayment) {
        /** Waiting first payment */
    }

    if ($webhook->data->paymentIntent->status === PaymentIntentStatus::WaitingPaymentPart) {
        /** Waiting part payment after partially paid */
    }

    /** Your code here */
}

function handlePaymentsWaitingConfirmationsWebhook(stdClass $webhookData) {
    $webhook = PaymentsWaitingConfirmationsWebhookFactory::create($webhookData);

    /** Your code here */
}

function handlePaymentsReceivedWebhook(stdClass $webhookData) {
    $webhook = PaymentsReceivedWebhookFactory::create($webhookData);

    if ($webhook->data->paymentIntent->status === PaymentIntentStatus::Paid) {
        /** Success payment code */
    }

    if ($webhook->data->paymentIntent->status === PaymentIntentStatus::PartiallyPaid) {
        /** Partially paid actions */
    }

    /** Your code here */
}