Paying back your friends is now as simple as sending an email, whether you’re chipping in for lunch or reimbursing your roommate for your share of the rent. Google Wallet is now integrated with Gmail, so you can quickly and securely send money to friends and family directly within Gmail -- even if they don’t have a Gmail address. It's free to send money if your bank account is linked to Google Wallet or using your Google Wallet Balance, and low fees apply to send money using your linked credit or debit card.
To send money in Gmail, hover over the attachment paperclip, click the $ icon to attach money to your message, enter the amount you wish to send, and press send.
Sending money in Gmail is currently only available on desktop; however, you can send money from Google Wallet at wallet.google.com from your phone or laptop.
The feature is rolling out to all Gmail users in the U.S. over the coming months. Watch for the $ icon in your attachment options.