Webhook response header must include "verificationToken" (Ringcentral presence Webhook)

Im trying to setup a webhook in between HA and Ringcentral to receive any presence changes (my call stage should be visualized via WLED Strip at the homeoffice door).
My challenge is that the Ringcentral API is expecting an verificationToken as header in the webhook response.

HA only sends a “200” response when the webhook is triggered but I see no way to add information to the response HA is sending back to Ringcentral.

Is there a way to meet the requirements of the Ringcentral API?
Any help and inspiration is highly appreciated.

Did you ever get this working? I was just looking for this exact use case. I got it working via the Zoom integration in HACS but I mainly use RC. I was thinking they’d actually be pretty similar in implementation.