From the documentation, it seems like I can only "filter" for:
• ListID or FullName • Active status • Filtering by date and time modified • Matching criterion for names • Ranges for names
Any ideas on if I can filter for other fields as well? I.e., on email address? I would prefer not to return all the customers, and iterate through them...
QuickBooks does not support searching for fields other than what you've already listed.