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Yes, this has been discussed a few times before. Check:
As you'll see, the requirement are always the same: you need a service to maintain the "stack" of codes so it knows which one to generate/give out next. The codes might be precreated in bulk or created on-the-fly, but either way the key is to maintain the last distributed index so you can keep popping new, unique ones off the stack and giving them to leads.
Thanks! I guess I just didn't use the right search terms. Will go through these others.