An update on Hua Hin immigration today transferring our extension of stay into the new passports. We only needed to present both our old and new passports, we did the photocopying there and filled out the form we were given. And it didn't cost anything, so now I can go out and get a coffee
TLDR : Answer Summary
This post provides an update on the process of transferring an extension of stay into a new passport at Hua Hin immigration, noting that only the old and new passports were needed, copies were made on-site, the necessary forms were filled out, and the process was free of charge.