What is a Flow Server Key, how do I create one, and where do I need to use it?

In the article on configuring your Flow Server, we saw how to configure most properties, except for the "Server Key".

Server keys are used by the Flow Server to authenticate API clients, for example a message engine or another Flow instance.  Keys may be added or revoked. This is done in the Keys tab of the Flow Server properties.

When adding a new key you must enter a description for the key as well as your windows credentials password that you are logged into the Windows machine with. If deployed on Docker or Linux, this would need to be the admin user, normally the default user is called "Root"

Once a key is created you will see the following message:

The Flow Server Key information is copied to the clipboard. The key can be pasted in any text editor and saved if needed. It has the following properties:

The Flow Server key will look similar to the following image