Humble Bundle campaign does not help with the missing transactions.
Cashback applicable on payment with store credit/gift cards - No
Max Transactions Allowed - 3 orders are allowed per user in a month
About Humble Bundle Campaign
Humble Bundle sells games, ebooks, software, and other digital content. Our mission is to support charity while providing awesome content to customers at great prices. We launched in 2010 with a single two-week Humble Indie Bundle, but we have humbly grown into a store full of games and bundles, a gaming membership service, a game publisher, and more.