Hello, I just arrived on 60 day Tr visa which was stamped in my passport . I also applied for the OA visa which was approved by the Thai Consular in United States after arriving in Thailand. Do I need to leave Thailand by plane and come back thru Suvarnabhumi Airport for the OA visa to be stamped in my passport. I also have the medical insurance in case they ask for this. What would be the cheapest way to do this? Fly to Cambodia. Thank you..