400k for the 1 year marriage extention seasoned in a Thai bank account for 2 months. The Non Imm O visa is 2000bt which you need before you can apply for the extention
Technically not needed but always best to enter your evisa number if you have one or your re-entry permit number if you're re- entering. That's why the field is there
Incorrect. Non Immigrant O visa is 90 days, extension of stay is 1 year, it's not an extension of the visa, it's an extension of your stay in Thailand. The extension is not a visa in any shape or form.