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How do I add a custom webhook endpoint for Klaviyo to call when a user unsubscribes for a list? Does this exists? It’s a must have feature of an email provider. If this isnt available how else can I keep subscription statuses synced with my application database?

How can I add a custom webhook endpoint for Klaviyo to notify my system when a user unsubscribes from a list? Is this feature currently available? It's crucial for syncing subscription statuses between Klaviyo and my application Minecraft.  If a direct webhook isn’t available, what alternative methods can I use to keep the subscription statuses updated in my app's database?