Unfortunately no such thing as global variables.
There are a few ways to accomplish what I think you’re looking for though:
You could have your value as a pipeline parameter. Have a first pipeline that gets your token, and then executes a second pipeline, passing the token as a pipeline parameter. Then that second pipeline will have access to the parameter (like a global variable) for all of his steps (calling other pipelines, etc.)
You can keep passing the token along from snap to snap. In your example, the pipeline execute snaps should have output documents with an “original” array containing the data that was passed in to the snap. if your token was part of that, you should be able to use a mapper to put the value back where you want it for the next downstream snaps, etc.