What documents and process are needed to extend a visa in Jomtien?

To extend a visa in Jomtien, individuals should prepare the same documents required during the initial application. This may include bar tabs from the past six months for certain types of visas, as well as proof of participation in soft power activities if applicable. It's advised not to use an agent for this process, as many suggest that handling the extension personally or opting for a border bounce might be easier.