Online PHP editor | output for Rn87X

<?php $signature = 'sha512=FDE5518801C115C4886311877B4C37F6C26ABACE01ADB973EF372FB51C8F1E5321A83717161AD7DEFFD46F5013900E68B6220F3B25E9302A4208A9C673D32749'; $json = '{"notificationId":"4bbba8fb-1d32-46b6-a513-a9ca2fed885c","eventType":"net.authorize.customer.subscription.created","eventDate":"2019-11-27T06:20:36.3621687Z","webhookId":"a2929d59-147e-4400-a2bb-b3bd25a0311d","payload":{"name":"Test subscription","amount":290.00,"status":"active","profile":{"customerProfileId":1921894828,"customerPaymentProfileId":1834842681,"customerShippingAddressId":1879009509},"entityName":"subscription","id":"6168233"}}'; $secret = 'F7B582AFFA9372866965456CFAC0D1B1219258F955FD5266D1A96BF9BE3C85F7D54C7CDFF9EF3EE7D3916EACB5EE920167F557BBB307288C17FBD169F0257AB4'; //To check the header and signature is true if (hash_equals(strtolower($signature), 'sha512=' . hash_hmac('sha512', $json, $secret))) { echo 'valid'; }else{ echo 'invalid'; }