Not able to add custom fields data in zoho books contacts with deluge script

Hey here i have written the deluge script in zoho crm to send data of contacts in zoho books but only contact_name is getting entered in zoho data

vendor_data = Map();

vendor_data.put("contact_name",beneficiary_record.get("Name"));

vendor_data.put("email",beneficiary_record.get("Email"));

vendor_data.put("phone",beneficiary_record.get("Phone"));

vendor_data.put("contact_type","vendor");

vendor_data.put("cf_customer_id","recordId");

l = list();

m = Map();

m.put("index", 1);

m.put("value", "NEW ID CONETENT");

l.add(m);

vendor_data.put("custom_fields",l);

create_vendor_response = zoho.books.createRecord("Contacts",books_org_id,vendor_data,"booksconnection");

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