Google first added the functionality to Gmail for the web in May 2013, long before Google Payments was formed to handle all your financial information. That means it took the company almost four years to bring the feature to Android, for whatever reason.
To use the new feature, just tap on the attachment icon and choose whether you want to send or request money. You can receive or request money right from the email itself, without having to install a payment app. Furthermore, you can even set it up so the money you receive goes directly into your bank account.
The best part is that you can exchange money with more than just other Gmail users. As long as the person you are sending money to or requesting money from has an email address, you’ll be able to pull off the transaction. Oh, and it doesn’t cost anything for the sender or for the recipient. Google is really trying to make sending money as easy as emailing files.
The catch is that the feature is only available for Gmail users in the U.S. Google didn’t say if and when it plans to expand the ability to send and request money to other countries, nor when iOS users can expect to get the same update that their Android counterparts just got. Maybe before 2020?