I'm trying to register and use a webhook programmatically. When creating the webhook and trying to register it via the API (in the Attach tab), the initial server message looks like this:
{
"realtimeapi_code": "KTTqE"
}
At that point, I always receive an error "The Callback URL {webhook.url} has not been implemented". According to the docs, the webhook response must contain a header with the "realtimeapi_code" value. How can this be done? API docs screenshot