PayPal\Api\WebhookEvent::validateAndGetReceivedEvent PHP Method

    public static function validateAndGetReceivedEvent($body, $apiContext = null, $restCall = null)
    {
        if ($body == null | empty($body)) {
            throw new \InvalidArgumentException("Body cannot be null or empty");
        }
        if (!JsonValidator::validate($body, true)) {
            throw new \InvalidArgumentException("Request Body is not a valid JSON.");
        }
        $object = new WebhookEvent($body);
        if ($object->getId() == null) {
            throw new \InvalidArgumentException("Id attribute not found in JSON. Possible reason could be invalid JSON Object");
        }
        try {
            return self::get($object->getId(), $apiContext, $restCall);
        } catch (PayPalConnectionException $ex) {
            if ($ex->getCode() == 404) {
                // It means that the given webhook event Id is not found for this merchant.
                throw new \InvalidArgumentException("Webhook Event Id provided in the data is incorrect. This could happen if anyone other than PayPal is faking the incoming webhook data.");
            }
            throw $ex;
        }
    }

<?php

$apiContext = (require __DIR__ . '/../bootstrap.php');
// # Validate Webhook
// PHP Currently does not support certificate chain validation, that is necessary to validate webhook directly, from received data
// To resolve that, we need to use alternative, which includes making a GET call to obtain the data directly from PayPal.
//
// ## Received Body from Webhook
// Body received from webhook. This would be the data that you receive in the post request that comes from PayPal, to your webhook set URL.
// This is a sample data, that represents the webhook event data.
$bodyReceived = '{"id":"WH-36G56432PK518391U-9HW18392D95289106","create_time":"2015-06-01T20:21:13Z","resource_type":"sale","event_type":"PAYMENT.SALE.COMPLETED","summary":"Payment completed for $ 20.0 USD","resource":{"id":"2FY57107YS3937627","create_time":"2015-06-01T20:20:28Z","update_time":"2015-06-01T20:20:46Z","amount":{"total":"20.00","currency":"USD"},"payment_mode":"INSTANT_TRANSFER","state":"completed","protection_eligibility":"ELIGIBLE","protection_eligibility_type":"ITEM_NOT_RECEIVED_ELIGIBLE,UNAUTHORIZED_PAYMENT_ELIGIBLE","parent_payment":"PAY-2SV945219E505370PKVWL5DA","transaction_fee":{"value":"0.88","currency":"USD"},"links":[{"href":"https://api.sandbox.paypal.com/v1/payments/sale/2FY57107YS3937627","rel":"self","method":"GET"},{"href":"https://api.sandbox.paypal.com/v1/payments/sale/2FY57107YS3937627/refund","rel":"refund","method":"POST"},{"href":"https://api.sandbox.paypal.com/v1/payments/payment/PAY-2SV945219E505370PKVWL5DA","rel":"parent_payment","method":"GET"}]},"links":[{"href":"https://api.sandbox.paypal.com/v1/notifications/webhooks-events/WH-36G56432PK518391U-9HW18392D95289106","rel":"self","method":"GET"},{"href":"https://api.sandbox.paypal.com/v1/notifications/webhooks-events/WH-36G56432PK518391U-9HW18392D95289106/resend","rel":"resend","method":"POST"}]}';
/**
 * This is one way to receive the entire body that you received from PayPal webhook. This is one of the way to retrieve that information.
 * Just uncomment the below line to read the data from actual request.
 */
/** @var String $bodyReceived */
// $bodyReceived = file_get_contents('php://input');
// ### Validate Received Event Method
// Call the validateReceivedEvent() method with provided body, and apiContext object to validate
try {
    /** @var \PayPal\Api\WebhookEvent $output */
    $output = \PayPal\Api\WebhookEvent::validateAndGetReceivedEvent($bodyReceived, $apiContext);
} catch (Exception $ex) {
    // NOTE: PLEASE DO NOT USE RESULTPRINTER CLASS IN YOUR ORIGINAL CODE. FOR SAMPLE ONLY
    ResultPrinter::printError("Validate Received Webhook Event", "WebhookEvent", null, $bodyReceived, $ex);
    exit(1);
}
// NOTE: PLEASE DO NOT USE RESULTPRINTER CLASS IN YOUR ORIGINAL CODE. FOR SAMPLE ONLY
ResultPrinter::printResult("Validate Received Webhook Event", "WebhookEvent", $output->getId(), $bodyReceived, $output);