A web hook provides a link to another system by specifying its URL. This enables project data to be passed to that system for processing when certain stages are reached during a project. The data can be passed:
•automatically, when a particular status movement occurs
•manually, by clicking a button available at the project edit screen; these buttons are defined for the project type and appear when certain statuses are reached within a project, enabling data to be passed to another system
Existing web hooks are listed and you can click:
•Add to create another one
•for a listed web hook, 
then:
o Open to edit the entry
o Send Test Message to check the details are set up correctly and the message is received
o Delete to clear the web hook, providing it is not in use.