Is a pension letter from the French embassy sufficient for my first-year retirement visa extension in Thailand?

For the first year retirement visa extension, a letter from the French embassy confirming a monthly pension of over 65,000 THB is typically sufficient as financial evidence. However, it is becoming common for immigration officers to request additional documentation, such as an annual pension statement to verify the information provided in the letter. Therefore, while the letter is a critical document, it may be beneficial to prepare extra documents to avoid any issues during the extension process.