Hi @Rukhan, welcome to the community!
I am not sure I fully understand the problem. Are you not receiving the webhook coming from WhatsApp? This might be because your webhook is configured to wait for a GET request, but from looking at Get Started - WhatsApp Business Platform Cloud API (facebook.com), it seems Facebook/WhatsApp would send a POST request instead. So in a first step you’d probably need to switch the HTTP Method on your n8n Webhook node:
