Use of promo code unique to a lead

[Michelle_Tizian]

So I checked in the community and I couldn't any thing regarding the use of promo codes that are unique to leads.  I'm to create a program/campaign in Marketo for some leads who previously attended a lecture.  They are not a part of a campaign in SFDC or in Marketo.  But when I import their information in Marketo they will have their own unique password to access a video for either free or a special rate.  

So the question is, how do I even associate the promo code to the leads?  There's about 20 records.  Currently in my instance of Marketo, my tokens are not working and support is working on this.  Do I create a custom field for the promo code?  Do I import the promo code and then use the promo code token for the lead?  Any suggestions?

[Michelle_Tizian]

Thanks bgomes and Adam! It's been a while since I've played around with javascript, so I might have to go with Adam's suggestion first if my tokens are finally working.  But if not, I'm just going to have to play around with the javascript.  

[Anonymous]

I would use their {{lead.Marketo Unique ID}} token & a random string. So like WEB84{{lead.Unique ID}} so it becomes like WEB84H58fd4. //shrug// that's what I'd do. No Javascript.

[Anonymous]

I would set a custom field to store the values, JavaScript to generate the unique codes combined with SOAP API to update the records.

The JavaScript would be:

var chars = "ABCDEFGHIJKLMNOPQRSTUVWXTZabcdefghiklmnopqrstuvwxyz";

var string_length = 8;

var randomstring = '';

var charCount = 0;

var numCount = 0;

for (var i=0; i<string_length; i++) {

    if((Math.floor(Math.random() * 2) == 0) && numCount < 3 || charCount >= 5) {

        var rnum = Math.floor(Math.random() * 10);

        randomstring += rnum;

        numCount += 1;

    } else {

        var rnum = Math.floor(Math.random() * chars.length);

        randomstring += chars.substring(rnum,rnum+1);

        charCount += 1;

    }

}

SOAP API's syncMultipleLeads would update the database:
http://developers.marketo.com/documentation/soap/syncmultipleleads/