notifications/ValidateWebhookEvent.php
<?php use \PayPal\Api\VerifyWebhookSignature; use \PayPal\Api\WebhookEvent; $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 makes a call to PayPal's verify-webhook-signature API.

/** * 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 $requestBody */ $requestBody = '{"id":"WH-9UG43882HX7271132-6E0871324L7949614","event_version":"1.0","create_time":"2016-09-21T22:00:45Z","resource_type":"sale","event_type":"PAYMENT.SALE.COMPLETED","summary":"Payment completed for $ 21.0 USD","resource":{"id":"80F85758S3080410K","state":"completed","amount":{"total":"21.00","currency":"USD","details":{"subtotal":"17.50","tax":"1.30","shipping":"2.20"}},"payment_mode":"INSTANT_TRANSFER","protection_eligibility":"ELIGIBLE","protection_eligibility_type":"ITEM_NOT_RECEIVED_ELIGIBLE,UNAUTHORIZED_PAYMENT_ELIGIBLE","transaction_fee":{"value":"0.91","currency":"USD"},"invoice_number":"57e3028db8d1b","custom":"","parent_payment":"PAY-7F371669SL612941HK7RQFDQ","create_time":"2016-09-21T21:59:02Z","update_time":"2016-09-21T22:00:06Z","links":[{"href":"https://api.sandbox.paypal.com/v1/payments/sale/80F85758S3080410K","rel":"self","method":"GET"},{"href":"https://api.sandbox.paypal.com/v1/payments/sale/80F85758S3080410K/refund","rel":"refund","method":"POST"},{"href":"https://api.sandbox.paypal.com/v1/payments/payment/PAY-7F371669SL612941HK7RQFDQ","rel":"parent_payment","method":"GET"}]},"links":[{"href":"https://api.sandbox.paypal.com/v1/notifications/webhooks-events/WH-9UG43882HX7271132-6E0871324L7949614","rel":"self","method":"GET"},{"href":"https://api.sandbox.paypal.com/v1/notifications/webhooks-events/WH-9UG43882HX7271132-6E0871324L7949614/resend","rel":"resend","method":"POST"}]}'; $signatureVerification = new VerifyWebhookSignature(); $signatureVerification->setAuthAlgo("SHA256withRSA"); $signatureVerification->setTransmissionId("d938e770-8046-11e6-8103-6b62a8a99ac4"); $signatureVerification->setCertUrl("https://api.sandbox.paypal.com/v1/notifications/certs/CERT-360caa42-fca2a594-a5cafa77"); // todo: this isn't going to work $signatureVerification->setWebhookId("9XL90610J3647323C"); $signatureVerification->setTransmissionSig("eDOnWUj9FXOnr2naQnrdL7bhgejVSTwRbwbJ0kuk5wAtm2ZYkr7w5BSUDO7e5ZOsqLwN3sPn3RV85Jd9pjHuTlpuXDLYk+l5qiViPbaaC0tLV+8C/zbDjg2WCfvtf2NmFT8CHgPPQAByUqiiTY+RJZPPQC5np7j7WuxcegsJLeWStRAofsDLiSKrzYV3CKZYtNoNnRvYmSFMkYp/5vk4xGcQLeYNV1CC2PyqraZj8HGG6Y+KV4trhreV9VZDn+rPtLDZTbzUohie1LpEy31k2dg+1szpWaGYOz+MRb40U04oD7fD69vghCrDTYs5AsuFM2+WZtsMDmYGI0pxLjn2yw=="); $signatureVerification->setTransmissionTime("2016-09-21T22:00:46Z"); $webhookEvent = new WebhookEvent(); $webhookEvent->fromJson($requestBody); $signatureVerification->setWebhookEvent($webhookEvent); $request = clone $signatureVerification; try { /** @var \PayPal\Api\VerifyWebhookSignatureResponse $output */ $output = $signatureVerification->post($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, $request->toJSON(), $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->getVerificationStatus(), $request->toJSON(), $output);