@Seanchhun
It would be verified in your country if you have linked and confirmed a credit card on your account.
However the option to receive paypal payments is sadly not available in Cambodia.
You can only send payments for purchases funded by your (confirmed) credit card.
Paypal varies a lot country to country and can only offer the services that the banks / governments of that country allow it to offer.
There are quite a few countries unable to receive paypal payments.
https://www.paypal.com/ga/webapps/mpp/ua/residence-full
Advice is voluntary.
Kudos / Solution appreciated.
