Good day @nafid Thank you for posting to the PayPal community. Yes, PHP can be utilized for webhook verification. For more information, kindly refer to the provided detailed guide links below. https://developer.paypal.com/api/rest/webhooks/rest/ https://developer.paypal.com/api/rest/webhooks/rest/#link-additionalinformation I would suggest to please contact your website developer (or) the support of the third-party platform (WooCommerce) to handle the internal website code. If you send a false or incorrect request for verification, the response will indicate that the webhook signature is invalid. This response will likely include an error message or a status code indicating the failure of the signature verification. If your still facing issues, please create an MTS ticket via - https://www.paypal-support.com/s/?language=en_US with the detailed information and error details. Sincerely, Kavya PayPal MTS If this post or any other was helpful, please enrich the community by giving kudos or accepting it as a solution.
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