I have been using Paypal for many years. I originally signed up for it to be able to use it on eBay, but have since started using it to pay and receive money for other sorts of transactions. I really like it. It can be hacked, of course, but their Support people do a good job of preventing that. There are other services, including Google Wallet, WePay, 2CheckOut and Skrill but none of these are as widely uses and accepted as Paypal is.