Count of unique customers that placed their first order
Formula
New Customer Customer = DISTINCT(Customer ID) WHERE Payment Status IS NOT "Voided" AND Customer Order Count = 1
Explanation
New Customers are the Count of Unique Customers who placed their first Gross Order in the selected Date Range.
Notes
Customers that purchase a "Gift Card" in their first order are also treated as new customers even though they aren't by Shopify.