import { Resend } from 'resend';

const resend = new Resend('re_xxxxxxxxx');

const { data, error } = await resend.contactProperties.create({
  key: 'company_name',
  type: 'string',
  fallbackValue: 'Acme Corp',
});

{
  "object": "contact_property",
  "id": "b6d24b8e-af0b-4c3c-be0c-359bbd97381e"
}