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You can do that by setting the Webhook “JSON Pass-through” to YES (it is “No” by default), when creating or editing a webhook.
Then, you will be able to map the entire JSON body payload in another module.
Hope this helps! Let me know if there are any further questions or issues.
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— @samliew
P.S.: Did you know, the concepts of about 70% of questions asked on this forum are already covered in the Make Academy. Investing some effort into it will save you lots of time and frustration using Make later!