Personal experience sharing,
I passed my Radio certificate RT license in Toronto Canada,
The process was easy as heck just needed to show up on Canadian land and make a legal entry into Canada by Visa (probably tourist) USA green card holder can enter with no hassle but for other countries please check the immigration website.
I found the examiner from Examiner Search portal and then connected him through email or phone numbers are there just in case,
I met the examiner at YYZ airport, the exam was simple with 20 MCQ choice-based answers and easy. The total time process was like 1-2 hours, especially the paperwork with the temporary certificate in hand.
You can even return flight the same day no need to get hotels or you can stay in Canada if you want to see Niagra Falls or something
I did this exam for my DGCA license conversion in future to cut the WPC exam (That's whole another story)
This whole thing cost me around $150 Exam fees+ Airlines ticket+uber and meals this is minimum
It will take months to receive the original certificate via mail but that's the examiner's headache probably they gonna send it to your home address.
Loved it no stress easy pisy