Must be unique. 1~20 characters, including only numbers, upper & lower case Latin letters, Vietnamese letters, CJK characters, common Hiragana/Katakana, modern Hangul syllables, special symbols "-", "_".
1~20 characters, including only numbers, upper & lower case Latin letters, Vietnamese letters, CJK characters, common Hiragana/Katakana, modern Hangul syllables, special symbols "-", "_".