WhatsApp Webhook Setup

I have a PHP-based web application that needs to react instantly whenever a new message comes in through my WhatsApp Business account. I already hold the Meta Business credentials; what I need now is a properly configured webhook endpoint, its verification handshake, and any supporting PHP code so that the event “new message received” reliably reaches my server, is parsed, and can be logged or forwarded to the rest of my app.

You will:

• Register and verify the webhook inside Meta’s developer console.
• Build the PHP endpoint that captures and validates the incoming JSON for the new-message event.
• Return a brief setup document so I can reproduce the configuration on staging or production.

I’ll test by sending a live message from WhatsApp; a successful run means the payload shows up in my application log with no errors.

I have attached the .php file for reference this page link I have register in URL section of meta webhook configuration and also subscribed for messages and flow.

This .php file is creating the debug.txt also in my hostinger but meta_debug_log.txt is not getting created concluding that 'if' statement of POST is not returning true.