I wonder if the encryption and decryption of requests to the endpoint to communicate with WhatsApp flows is necessary and mandatory?

I have managed to create Flow without an external uri without a problem but when it comes to creating flows with an external uri things become very complicated, especially on the endpoint side, this encrypts and decrypts communications and for this a public and private key is required, The public key must be uploaded to the graph api to achieve this encryption, etc. What I'm trying to do is load ice cream flavors, so it's not sensitive data. If anyone could guide me on this matter I would greatly appreciate it.