OK I’ll give you a real answer since I actually travel internationally. What they require is a negative PCR test within 48 to 72 hours of your arrival to the country depending on the local laws. There is no verification of this, either a police officer or an airport employee will look at it for two or three seconds and move you along. I was nervous as hell that they would check the serial number or that they would have some kind of verification but they don’t.
I would recommend having a vaccine card just in case something changes, but they never ask for it.
I recommend having result pages ready to go for the start of your trip and the end of your trip before you travel, otherwise you will be scrambling on photoshop. If you can get a copy of a test result in the language of the country that you are traveling to that is the most perfect because it only takes editing a few numbers.
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