Unique Submission ID

Hi,
First of all, thank you so much for supporting such a powerful plugin.
We are using it to track scholarship applications.
We want to output a unique submission number after form submission.
I am able to modify and hook into successMessage using the following code.

function my_cforms_logic($cformsdata,$oldvalue,$setting) {
    if ( $setting == "successMessage" && $oldvalue<>'' ){

        ### only form #1 (default form) should be affected:
		if ( $cformsdata['id']=='' ){
			return $oldvalue .$submissionID . '<br />Form submitted on '.date('D, d M Y H:i:s');

		}

    }
}

Thoughts:
1. Get last insert ID and use it as application tracking.
2. Use submission IDs generated.

Thanks for the help.

https://wordpress.org/plugins/cforms2/