A GUI for exploring Liferay's API's in Liferay DXP 7.3.
Find the widget in the Control Panel under System > API GUI.
View results of API requests and see examples of how to make the request using JavaScript.
Explore available schemas.
Update ./gradle-local.properties so that it contains:
liferay.workspace.home.dir=/path/to/liferay/home
$ blade gw build
$ blade gw deploy