title: Confused about needing a Google Wallet Merchant account to enable in-app billing
body: <p>I've pretty much only found out that "You must have a Google Wallet Merchant account to use Google Play In-app Billing." But I don't understand... What is it for? Do I actually need this? What does it do? How and where do I get one, and does it cost anything? The Google Wallet website seems to only have information for actual stores, not apps.</p>
  
  <p>What I want is there to be a free, limited version of my app, but the user could pay a monthly subscription to get access to the full features. </p>