Additional thought, you could put a unique promo code on the senders copy (code ... | Hacker News

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cehrnrooth on Sept 21, 2013 | parent | context | favorite | on: A VC’s take on the Season 5 premier of Sharktank

Additional thought, you could put a unique promo code on the senders copy (code tied to their account) where if they buy X credits they get Z free.

gfodor on Sept 22, 2013 [–]

Yeah good idea! Right now recipients of cards have a code they can punch in to buy credits for who ever sent the card. If I send a free card to the sender also I could tweak this logic easily.

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