Here's the Google Play developer agreement: https://play.google.com/about/developer-distribution-agreement.html https://play.google.com/about/developer-distrib

Here's the Google Play developer agreement: https://play.google.com/about/developer-distribution-agreement.html https://play.google.com/about/developer-distribution-agreeme... They changed the wording to be less clear, but I'm pretty sure you're only supposed to use Google Wallet to collect payments. Even if the new language doesn't state this as clearly as it used to, I'm sure they can go back to the old language at a moment's notice if Amazon starts undercutting their payment infrastructure (and the 30% it nets them).