I couldn't find this in a recent search but can I cross to cambodia by land border to get my visa stamp and come back a day or two later? I have to leave by March 24th. Also I know I need a PCR or APK test. I thought they were one and the same. Can I buy this at my local 7-11 and take it in front of them or do I have to go somewhere and do it so there is a record of when I took it? Time is not on my side here.