Available since version 5.6.
Process Variables provide an alternative way of initializing variables at the beginning of a Process. They are functionally comparable to a sequence of Code blocks with Assign Variable set originating from a Trigger.
You can find them in the Process Editor, here:
Process Variables have three properties: Name, Value, and Secret:
The Value is dynamic, and it can be any JSON value (RFC 8259) or an environment variable. Examples of valid values:
42true"Foo"{"foo": [1,2,3]}#env.foo
Values can not be expressions. For example, these would not work:
2+2#env.foo + #env.bar
Process Variables are referenced like other variables, i.e. with the #var.-prefix. They can be reassigned using a Code block with a variable of the same name.
In the Process Instance view, Process Variables can be seen in the Trigger-element. If a Process Variable has the Secret-setting enabled, the value is masked in this element. Secret Process Variables are not automatically masked in subsequent elements. Make sure that secrets aren't leaking elsewhere, e.g. by skipping the logging of results and parameters of subsequent elements which use the secret.