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It's probably not quite what you're looking for, but you could create a "Package" that people could buy, where you add an "Extra" text file with a coupon link in it. However, everyone who bought that Package would get the same coupon link, and it would work just like any other coupon link.
(It’s easy for people who volunteered their email addresses, because I know who they are, but for the other buyers, I’m at a loss as to how to do this.)
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If you're willing to deal with people individually, everybody who buys a Leanpub book gets a receipt with a unique Purchase ID. You can see the IDs for purchases of your book here: https://leanpub.com/YOURBOOK/individual_purchases. So, someone who buys a book could share their Purchase ID with you, and you could check it against your records, to see if it's real.
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