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This is the best way to add a unique ID to your form : http://www.jotform.com/help/79-Add-Custom-Unique-IDs-to-your-Form-Submissions
You can customize the number and get the ID as you need.
Let us know if it helps,if not, we will be glad to assist you.
Thank you :)
Almost there. Can I add this unique ID to the email subject line ?
On behalf of my colleague, you are welcome. If you have any additional information or assistance, please do not hesitate contacting us. We will be glad to help.