Your question is a little vague to me. Are you trying to modify the admin script to deliver a webhook? Do you want to know how to deliver a message via a webhook? If you want to know how to deliver a message via a webhook, The following post describes how to integrate webhooks into your scripts.
But when it comes to modifying the premade script to deliver a webhook message every-time a command or a specific command is fired. At most, you only need to add a function which’ll take up a few lines near the beginning of the script. Then call the function whenever and wherever it is needed.