The Customer Token is the SSO identifier for a customer. You can use the Customer Token to find out more information about the customer using the SSO web services.
Use the VendorSSOCustomerIdentifierSet web service to send your customer identifier to SSO. SSO stores this identifier for future retrieval. The identifier can be a text identifier or a number which maps to an ID in your database, up to 50 characters.
Use the VendorSSOCustomerIdentifierGet web service to retrieve your own customer identifier for the current customer.