Interesting to see this get traction here today, this article is for the web version which has been around for awhile. But we did just (in March) launch this for Android: https://blog.google/products/gmail/send-and-request-money-in... & https://techcrunch.com/2017/03/14/you-can-now-send-and-reque...
"Wallet can't be used: This could be because Google Wallet isn't supported in your country or because you're using a business account. To see your purchases from Google Play and other products, go to the payments center."
I've unintentionally "poisoned" my personal Gmail account by adding Android Developer capabilities to it. An unexpected negative side-effect.
Google has under-designed its Account concept asserting an account is entirely for business if it's merely associated with an Android Marketplace capability.
Google should really support multiple roles for an account. At the least, caution users when adding Android Developer Marketplace capabilities to Gmail accounts about the new limitations this choice will impose.