Hi,

I'm trying to add a customer in ZOHO Books using create contact API. But, It seems this API uses contact_name as a primary field because whenever I'm trying to create a new customer with an existing contact name but a different email address, there is 400 Bad request with the message: "The customer \"ABC XYZ\" already exists. Please specify a different name.".

Can we use email as a primary field instead contact_name?

Thanks,