This one's easy: if you use Android Pay on a Nexus device before December 31st, 2015, Google will add a $20 Best Buy e-gift card to your Android Pay... digital repository of cards. (Side note: what are we supposed to call the collection of cards and gift cards and loyalty stuff in Android Pay if not a wallet? This is awkward.) There is a limited supply of these gift cards, however, so the promo may end before 12/31 if people really get on this (I certainly will be taking advantage ASAP).

The nitty-gritty details aren't very rigorous, but here's what you need to know.

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