https://www.techradar.com/news/apple-releases-new-siri-shortcuts-app-for-beta-testing

At WWDC 2018 Apple promised to smarten Siri up for iOS 12 and, keeping to its word, the company has released a beta version of the Siri Shortcuts app via TestFlight to selected third parties.

Developers looking to take the new IFTTT-like app for a test drive can request access by logging into the Developer Center, following which, Apple will send a handful of testers an email notification granting permission.