IPs ranges for whitelisting webhook requests in our dev environment

Our team had previously integrated the avatar video generation in our codebase and now wanted to move towards integrating the webhook events that Heygen provides.

For our application, we have a dev environment which can only be accessed via a VPN. So, despite adding signature verification on the webhook endpoint, the webhook events that heygen sends to our dev environment server, will be blocked because of VPN access issue.

@heygen team, can you please share a list of your IP ranges which we can add to our VPN whitelist, so that the webhook events can be processed on the dev environment?