ATM, because this is bigger and more professional. Insert China card first, and press Chinese. The machine will issue the card first, and only when you take the ATM card will you spit out the money. I will give you Thai baht in Thailand, Vietnamese dong in Vietnam and US dollars in Cambodia. Because Cambodia has a dual currency system, both US dollars and Cambodian riel can be used directly.
2. About credit cards: Many hotels, guesthouses, restaurants and shops in big cities such as Phnom Penh and Siem Reap now accept Visacard.
3: PS: It's best not to use a credit card because it's not very safe. If you use a credit card, please read the handbook of the credit card company in detail. Because ordinary passengers don't need to swipe their cards wherever they spend, it is better to prepare cash.