We can import a customers list via a CSV file.
This is a one-time operation and should be run only at system setup time.
If you want to bulk-insert customers with your ststem already installed, you should use our Customers Handling API.

In order to import your data, you must produce a CSV that exactly matches the format documented in client_import_fields_list_with_users.xlsx

We will not be able to import incomplete or incorrect files.