Historically, scams of all kind would involve the victim wiring funds to a stranger, but consumers have gotten wise to this and the scammers have found a new way for the victim to pay them.
They're called Green Dot MoneyPak cards. They are reloadable debit cards and are available everywhere. They are typically used by people who don't have, or want, bank accounts and they can be used to pay things such as your phone, cable, or credit card bill.
Scammers like the cards because they are more convenient than a money wire, but just as untraceable.
How the scammer demands payment is a growing trend. The victim is instructed to purchase a Green Dot MoneyPak card, load the card with cash, then scratch off the back and call with the number. Once that number is provided to the scammer they are able to collect the funds.
Green Dot MoneyPak cards are not linked to bank accounts - the money is on the card. Anyone you share your card number with has instant access to the funds and can siphon the card dry.
Even though Green Dot Money Pak cards are available in many locations, the scammers tend to push the victims to Walmart to purchase them. They want you to go to a place you know and trust so you feel comfortable purchasing the card.
Green Dot MoneyPak cards do serve a purpose for some people. The cards aren't the problem, so remember if you ever use them, never share your number with a stranger.