display Registrant ID in [REGISTRATION_DETAIL]

When the Registrant register for an event then he will get a "User email body"

Dear [FIRST_NAME] [LAST_NAME]
You have just registered for event [EVENT_TITLE]. The registration detail is as follow :
[REGISTRATION_DETAIL]
Regards,
Events management Team

but in [REGISTRATION_DETAIL] there is no Registrant ID so I would like to add it to "User email body" so that when the Registrant prints "User email body" as a ticket Registrant ID serves as a Unique ID to verify at the time of the event.

So can I know how to achieve it, Does [Registrant_ID] work?

As replied, need to edit code to support [REGISTRATION_ID] tag. Please reply the support ticket sending me FTP account of your site so that I can edit the code for you !

Regards,

Tuan