The background of the attention is threefold. First, the volume of fund transfers handled through payment systems has increased dramatically. That means "settlement risk" which arises when a payment is not made as expected, has also increased.

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When a trade of goods or services is made, the buyer should pay
"money" to the seller in exchange for them.
In some cases, the money would take the form of banknotes and
coins, and in other cases, the deposit money is used. This
process is usually called "payment."
When a payment is successfully made, the obligation between
the buyer and the seller is discharged.
That is to say, payment systems are extremely important, but
their operation is carried out underground and out of sight.
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