{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "#/components/schemas/ContactUpdate",
  "title": "ContactUpdate",
  "type": "object",
  "properties": {
    "firstName": {
      "type": "string",
      "description": "The first name of the contact."
    },
    "lastName": {
      "type": "string",
      "description": "The last name of the contact."
    },
    "msisdn": {
      "type": "string",
      "description": "The phone number of the contact."
    },
    "custom1": {
      "type": "string",
      "description": "Custom field 1."
    },
    "custom2": {
      "type": "string",
      "description": "Custom field 2."
    },
    "custom3": {
      "type": "string",
      "description": "Custom field 3."
    },
    "custom4": {
      "type": "string",
      "description": "Custom field 4."
    }
  }
}