How to check if SharePoint Webhooks are enabled?

[Richard Bourke]

Does anyone know if there is a way to check if SharePoint Webhooks have been enabled in a tenant in O365? I'm trying to request a subscription but getting 404, not sure if I'm doing it wrong or its just not working for my tenant.

[#2]

For now webhooks are only available in Office 365 Developer tenants

[#3]

Thanks Juan, I've just tried on my developer tenant and I get the same results. To test I'm just doing a Post via Fiddler to https://mydevtenant.sharepoint.com/api/web/lists('listid')/subscriptions. I get a 404 response. Just wondering if there is any mechanism to know for sure if Webhooks are available on the tenant.

[#4]

http://dev.office.com/sharepoint/docs/apis/webhooks/get-started-webhooks

[#5]

Thanks Robert, that link is useful and I jumped through all the hoops only to end with a subscription response of 

"The requested operation is part of an experimental feature that is not supported in the current environment."

Is there really no easier way to find out if the Webhooks feature is active on a tenant?