How to create zoho books contact from zoho crm custom function

Hi.

I am trying to create a zoho books customer from a zoho crm custom function.

I got it working, but it doesn't add in the contact information section (screenshot attached), just the billing or shipping address sections.

I think i need to add a contact persons in the request to make that happen. But when I try to do that I get this error:

that error is from this code:

contactperson = Map();
contactperson.put("first_name",fName);
contactperson.put("last_name",lName);
contactperson.put("email",email);
contactperson.put("phone",phone);
billingAddress = Map();
billingAddress.put("attention",fName + " " + lName);
billingAddress.put("address",street);
billingAddress.put("city",city);
billingAddress.put("state",state);
billingAddress.put("zip",zip);
booksContactInfo = Map();
booksContactInfo.put("contact_name",fName + " " + lName);
booksContactInfo.put("contact_persons",contactperson);
booksContactInfo.put("currency_id",3474557000000000097);
booksContactInfo.put("billing_address",billingAddress);
booksContactInfo.put("tax_authority_id",3474557000000360005);
booksContactInfo.put("tax_id",3474557000000360007);
booksContactInfo.put("is_taxable",true);
response = zoho.books.createRecord("Contacts","788939832",booksContactInfo,"zoho_books_create_update");
info response;
booksID = response.get("contact").get("contact_id");
info booksID;

If I comment out the contact persons stuff it created the contact but without the primary contact information section. I attached a screenshot

This seems similar to a lot of things I have done in the past that have worked.

I would appreciate any insight. Thanks so much in advance!

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