I am attempting to create a simple WhatsApp chatbot using Twilio. Facebook configurations are setup as well.
I am able to send a message successfully, but not able to receive a reply on WhatsApp. However, the message is successfully sent on WhatsApp to my number using the request from Postman as seen here:

The C# project code that contains the Endpoint and method: C# Endpoint method code
How can I successfully target my callback URL by sending a message to the Twilio WhatsApp number?