To create a PagerDuty subscription, you must have a PagerDuty endpoint. See Create a PagerDuty Endpoint in PagerDuty Integration Walkthrough. The walkthrough page also includes information about testing PagerDuty subscriptions and automatically triggering PagerDuty incidents.
These steps show how to open the Create Subscription panel from the details page for the topic that you want to add the subscription to. You can also open this panel from the Subscriptions list page, specifying the topic in the panel: Select Create Subscription, and then select a Subscription Topic.
On the Topics list page, select the topic that you want to work with. If you need help finding the list page or the topic, see Listing Topics.
On the topic's details page, select Create Subscription.
In the Create Subscription panel, for Protocol, select PagerDuty.
Notifications creates the PagerDuty subscription and sends a confirmation URL to its endpoint. The confirmation URL is valid for three (3) days. The subscription is pending until confirmation is received.