The recommended endpoint to list all webhook subscriptions of the publisher is /3.1/webhook_subscriptions which is actively maintained and provides access to the newest Cleeng webhook features such as webhook filtering or webhook verification.
The listWebhookSubscriptions endpoint is deprecated as a legacy endpoint and should no longer be used. It's still available for backward compatibility but it's no longer maintained.
JSON-RPC listWebhookSubscriptions method is deprecated. Use /3.1/webhook_subscriptions instead.