Need an Uber? Just send a message. Uber and Facebook said today that US users of Facebook Messenger can now sign up for the car-hailing service and request a ride, all without leaving a conversation or downloading the Uber app.

In a group chat, users get an alert that you've ordered a ride, and if you wish, you can share a map of your ride location—so your friends or coworkers are sure you're really on your way to dinner or that crucial business meeting. Meanwhile, ride status updates and receipts are delivered to you in a private chat message from Uber.

By layering additional services on top of Messenger, Facebook seems to be seeking the holy grail of messaging.

The new feature comes as Messenger moves deeper into its mission to morph from a mere messaging service into a platform on which other developers build their services. Facebook first signaled its intentions when the company cut off the ability for users to message in its core app over a year ago—forcing frustrated users to download the Facebook Messenger separately. The company swiftly made moves to open Messenger to outside developers (Giphy on Messenger, anyone?) and launched Business on Messenger, which lets businesses send receipts, notify customers when packages ship, and provide basic customer service all within the app.