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To be able to capture/listen to another extensions presence , the extension that is authenticated should be an admin extension. You should have 'Read Presence' and 'Webhook Subscription' permission added on to your app. 

allowSeeMyPresence is turned on for my users, I can see webhook presence events for my account, however when I specify another extension when creating a new webhook I get 403. What privilege is needed to create a webhook for an extension other than myself?

This is working. allowSeeMyPresence was turned off for the user that I was using.

Strange, I will try to figure out and get back to you.

On this subscription are we able to do the entire company? If so how would we go about this?

Our Subscription (Push Notification) API resource empowers developers to enable their client application(s) to create a single subscription (to one or more extension's) and continually receive push notifications in real time for each subscribed extension.

However, this subscription has an expiration time but using the official RingCentral SDKs enables developers to automatically renew the subscription(s) on a timely basis.

When using this approach for your application(s) to receive events on your RingCentral account, no polling is involved.

Subscription API: https://developer.ringcentral.com/api-docs/latest/index.html#!#Notifications.html

View the (official and community developed) RingCentral SDKs: https://developers.ringcentral.com/library/sdks.html

We also have a Tutorial in node.js which you could take a look at under the 'Tutorials' section on our developer portal:
https://ringcentral.github.io/tutorials/
https://ringcentral-tutorials.github.io/subscription-basics-nodejs-demo/

Will this help: http://ringcentral-api-docs.readthedocs.io/en/latest/notifications_subscriptions/ ?

At the same time it is impossible to get call direction directly from push notification. We are adding this option in one of the future releases.