How to obtain the Confirmation Number of an event, using Shorthands?

I want to obtain the confirmation number from booking events. I have webhooks for delivering JSON payloads that must include such information, and I tried the shorthand “{FORMFIELDS}”, expecting that it might bring the confirmation number, but without success.

Here’s a piece of the JSON payload that I designed for the JSON payload of a webhook, when someone books and event:

“formFields”:“Confirmation Number: Units : 1”

That doesn’t seem to be a confirmation number.

Does anyone knows something about how to obtain the Confirmation Number on JSON payloads from Webhooks?

Thank you very much

Sorry on the delay @ivanpt. You can include something like:

“confirmation”: “{REF}”

This will be a 12 digit code attached to the booking that we use to reference it.

I hope this helps.