CSV customer import now supports both new account creation and bulk updates

The CSV Customers Import feature in the admin panel has been updated to clearly support two different use cases: importing new customers and updating existing customer accounts in bulk.

• Creating new customer accounts:

  Remove the customers_id column entirely from the CSV file. This tells the system that a new customer account should be created for each row.

• Updating existing customer accounts:

  Keep the customers_id column and ensure the ID matches an existing customer account in the system. This ensures changes are applied to the correct account.

This update improves the safety and clarity of the CSV import process and reduces the risk of errors when managing large customer datasets.