type: object
properties:
  inbox_id:
    type: number
    required: true
  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