`Pacto#use` doesn't always mean stub.  Right now, in order to validate a live service you need to call use.  In fact, the difference between stubbed and live was really the `WebMock#allow_net_connect!` more than anything else.

See [Pacto Tutorial](https://github.com/maxlinc/pacto-tutorial/tree/master) and make sure you're able to update it with your changes.  I've got two branches there - `master` is the starting point for the tutorial, and `completed` is what it should look like if you follow all the steps.