Firstly you will need a Pager Duty account. If you don't already have one, you can sign up for a free trial here: http://www.pagerduty.com
In Pager Duty
You will need to add a new service in Pager Duty - here are the instructions: https://support.pagerduty.com/hc/en-us/articles/202828730-Adding-Services
Create a new service in Pager Duty called "Sinefa". Specify the Use our API directly option. Once you have created the service there will be an API key. This is what you put into the Action config on the Sinefa side.
Create a new Action under Settings > Events > Actions. Specify PagerDuty as the Action Type and enter the API Key obtained above in the Service Key field.
Any alerts that use this action will now raise and can be cleared in Pager Duty.
How to Setup Alerting