關於Cashless的意思和用法的提問

A: × The cashless payment systems has been spreading in China.
✓ Cashless payment systems have been spreading in China.

× A friend of mine travelled to China and he exchanged from Japanese yen to Chinese dollars.
✓ A friend of mine travelled to China and he exchanged his Japanese yen for Chinese dollars.

× But when he arrived there, he realized many stores in China didn’t allow people to pay a bill through cash.
✓ But when he arrived there, he realized many stores in China didn’t allow people to pay with cash.

× He ended up paying through his credit card.
✓ He ended up paying with his credit card.

× He felt like he shouldn’t had exchanged money.
✓ He felt like he shouldn’t have exchanged money.

Isn't it "Chinese yuan"?

A: × The cashless payment systems hasn’t spread in Japan so much.
✓ Cashless payment systems haven't caught on much in Japan.

A: You don't need the word "from".

Starting 2020/2, cashless payment at postal service counters will be introduced in Japan.

You can also say, As of 2020/2, cashless payment at postal service counters will be introduced in Japan.

But "starting" or "beginning" is perfect.

A: Cashless
Can you imagine a world where people never pay in cash? When someone makes a reservation for an airplane or a hotel, they pay online. Recently, many people use Air B n’ B. People can’t use this popular service without cashless technology. There are many services that need cashless technology. Therefore, even though people don’t recognize it, they can see cashless technology every day, everywhere.