Is it possible to send a User parameter value through to a FME Server Job as part of the URL (End of an URL Parameter value)??
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Yes, you can.
By default you do a POST request to submit a job over the REST API, as you can see in the documentation.
You then need to add the published parameters in the body.
But you can also use the direct url (pre 2019?) or create a webhook (2019?) where you can change the published parameters in the url: