Jeff,

You can setup Subscription using RingCentral API's and receive push notifications on inbound/outbound calling activity. 

Kindly take a look at our previously answered developer community article here for more information:
Using Push notifications on RingCentral

- AK

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I've tried to created a subscription, however, that's what I'm getting back: [ReadPresence] application permission is required for the following event filter: [/restapi/v1.0/account/~/extension/~/presence]

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You would need to add the permission [ReadPresence] on your application. To add the permission kindly login to https://developer.ringcentral.com using your Developer Account or Main Company number credentials and navigate to:

App-> Settings -> Under OAuth Settings -> Permissions Needed -> Add [ReadPresence] permission

Also, please note that the event filter you have provided above looks incorrect. You are supposed to pass in the extension number for the particular extension you wish to set up push notification for. 

You can look at Get Extension API endpoint for more information :
GET /restapi/v1.0/account/{accountId}/extension

https://developer.ringcentral.com/api-explorer/latest/index.html#/!/Company_Contacts/listExtensions

If you are unable to add the permission, kindly provide the app name and I can add the permission on your app. 

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Following the path you mentioned it shows: Information is not editable after you have applied for production. 

I guess its because my app is already in production.

No worries about the path, I'm using correctly, only for the post I replaced with "~".

Could you please add it for us? App name: "StripCurtains Extranet with message"

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Added the permission. Please make sure you test the permission in sandbox environment first. 

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Thanks, I can see the permission.

Now it shows: [SubscriptionWebhook] application permission is required for [WebHook]

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