@random, I think you are misunderstanding the webhooks. You cannot “attach” a javascript file to a webhook so it runs when the hook is called. The hook is designed to do a GET or POST to a specified website. You can specify a number of items to pass in the call including a structured query or JSON formatted items but not a javascript file. The JS file could run on the target site I suppose and provide the return data for the webhook. @Dave, can you help me here? 
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