CRM
KMMRCE's built-in customer relationship manager allows you to easily browse your customers and manage them.
Custom user fields
It's possible to save additional data about customers by creating custom user fields
Create a custom field
Go to Dashboard > Configuration > Custom user fields and depending on the type of data you want to save, create
a new field. As an example, if you want to ask the customers if they have a car or not, and save that information, you'd
create a "Select" field as demonstrated in the below screenshot:

Now save the fields.
API Integration
Please ask your integration team to integrate the new field into the registration form and user-profile update forms on your website, this will allow customers to populate this field.
Inspect details
You now have access to this data on the dashboard. You can also export the customers list, which includes each field and its values as a separate column in the exported document.