The easiest way to check the letter now is to print the credit report or check the personal big data credit.
The former can be printed in the Credit Information Center of the People's Bank of China, and the latter can be printed on WeChat: xinyouge, which can detect the credit status of big data. Including personal overdue, blacklist, etc.
Too many inquiries will affect personal credit, so you must choose a larger and more reliable platform for inquiry.