1. Important customer identity information: including personal identity information such as name, ID number or passport number, and corporate identity information such as company name and registration number. This information generally comes from legal identity documents or official registration institutions, and should be provided and verified by the customer himself or relevant institutions.

2. Bank account information: sensitive financial account information such as customer's bank account number, credit card number and payment password. This information belongs to the customer's privacy and personal property security, and can only be modified by the customer himself or an authorized agent.

3. Contact information: Without the consent of the customer or relevant parties, the customer's mobile phone number, email address and other contact information shall not be changed at will. This helps to protect customers' personal privacy and communication security.

4. Other legal information: such as the legal identity and welfare information of customers, such as tax registration number and social security number. Modifying this information usually requires strict compliance with relevant laws and regulations and legal procedures and systems.