Holding a tourism stamp/sticker visa (not visa on arrival), in order to apply for an 30 days extension, do I need to ask the accommodation room host to register my information to some official website within a required period? I do not see this from Thai immigration official website, but last year, the owner of the house I stayed registered and print a paper for me to carry to the immigration office. If yes, anyone knows the website address, and which period of time that I should be registered? Many thanks in advance!
TLDR : Answer Summary
To apply for a 30-day extension on a tourism stamp/sticker visa in Thailand, it's generally required that your accommodation is registered within 24 hours of your arrival. Your landlord should handle this process, and they can register your information on the official immigration website. The link to the registration site is https://extranet.immigration.go.th/fn24online/.