type: object
properties:
  name:
    type: string
    description: name of the contact
  email:
    type: string
    description: email of the contact
  phone_number:
    type: string
    description: phone number of the contact
  identifier: 
    type: string
    description: A unique identifier for the contact in external system
  custom_attributes:
    type: object
    description: An object where you can store custom attributes for contact. example {"type":"customer", "age":30}