What functions and procedures have you implemented or used in the user account?

The user personal account typically implements the following functions and procedures:

• Registration and authentication: creating an account, logging in, password recovery.
• Viewing and editing profile: changing personal data, uploading an avatar.
• Managing settings: changing password, notification settings, interface preferences.
• Viewing activity history: order history, payments, activity.
• Managing subscriptions or services: connecting/disconnecting services, payment.
• Feedback and support: sending messages to support service, viewing responses.

Example of a Java procedure for updating user profile:

public boolean updateUserProfile(int userId, UserProfileData newData) {
    User user = userRepository.findById(userId);
    if (user == null) return false;
    user.setName(newData.getName());
    user.setEmail(newData.getEmail());
    // other fields
    userRepository.save(user);
    return true;
}

Such functions ensure user convenience and security in system interaction.