Connex for QuickBooks Online can match customers by email.
What fields does Connex search?
Connex can only search one field at a time. By default, Connex searches the display name as field. If you chose billing address email, Connex searches the QuickBooks customer email address. If you need to search another field, please contact us.
If I select customer email, can Connex find customers with multiple emails?
If I select customer email, how does Connex create new customers?
Connex will map the display name as field using first name last name. Here is an example: