The PagerDuty integration API allows users to add PagerDuty's advanced alerting functionality to any system that can make an HTTP API call. PagerDuty is an alerting system for IT professionals. PagerDuty connects with a variety of systems (including monitoring tools and ticketing systems) and dispatches alerts via automated phone call, SMS and email. With the API users can add phone, SMS and email alerting to their monitoring tools, ticketing systems and custom software. The API uses RESTful protocol and responses are formatted in JSON.