LD申请了capital one的credit card，没有收入，但有itin。过几天capital one来信
要annual income，
其他几个要求比如w2都不行，但觉得这个应该还可以
if you're at least 21 years old and included income from someone else paying
your expense: letter detailing the amount and frequency of the income,
signed by the person paying your expense.
请问该怎么弄，写封信签上名就可以了么？
