How to identify existing customer record for BigCommerce customers who checkout as a guest?

If you are a registered customer in the BigCommerce store and you create an order as a guest customer, the “BigCommerce Order to NetSuite Order Add” flow identifies the existing customer record in NetSuite for a guest order with the same email address. 

To identify the existing customer record for registered customers who place an order as a guest customer, the secondary lookup criteria for the “BigCommerce Order to NetSuite Order Add” flow is updated as, 

[["email","is","{{email}}"],"AND",["isinactive", "is", "F"],"AND",["custrecord_celigo_bgc_bcim_nsid.custrecord_celigo_bgc_bcim_storeid","is", "g3uzz5c7jx"]]

The secondary lookup criteria will identify the existing customer record and,

• If the customer record is for a guest customer, then the customer record is updated with the incoming information. 
• If the customer record is for a registered customer, then the customer record is not updated with any of the incoming information.

Note: The secondary lookup is updated automatically only if you have the earlier default lookup criteria specified by the integration app.