As you probably already know, last week Google launched P2P payments via Gmail (and through the Google Wallet mobile/online interface). Once authenticated, users simply “attach” funds to an email message (see inset). Bank transfers (e.g., ACH) are free while card-based payments will cost senders 2.9% of the amount, with a $0.30 minimum. However, all transactions … Continue reading First Look: Google Wallet "Pay by Gmail" (and the Pain of Authentication)