Add subscriber to form by email address Response

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://raw.githubusercontent.com/api-evangelist/convertkit/main/json-schema/add_subscriber_to_form_by_email_address_response.json",
  "title": "Add subscriber to form by email address Response",
  "x-tag": "Forms",
  "type": "object",
  "properties": {
    "subscriber": {
      "type": "object",
      "properties": {
        "id": {
          "type": "integer"
        },
        "first_name": {
          "type": "string",
          "nullable": true
        },
        "email_address": {
          "type": "string"
        },
        "state": {
          "type": "string",
          "enum": [
            "active",
            "cancelled",
            "bounced",
            "complained",
            "inactive"
          ]
        },
        "created_at": {
          "type": "string"
        },
        "added_at": {
          "type": "string"
        },
        "fields": {
          "type": "object",
          "properties": {}
        },
        "referrer": {
          "type": "string"
        },
        "referrer_utm_parameters": {
          "type": "object",
          "properties": {
            "source": {
              "type": "string"
            },
            "medium": {
              "type": "string"
            },
            "campaign": {
              "type": "string"
            },
            "term": {
              "type": "string"
            },
            "content": {
              "type": "string"
            }
          },
          "required": [
            "source",
            "medium",
            "campaign",
            "term",
            "content"
          ]
        }
      },
      "required": [
        "id",
        "first_name",
        "email_address",
        "state",
        "created_at",
        "added_at",
        "referrer",
        "referrer_utm_parameters",
        "fields"
      ]
    }
  },
  "required": [
    "subscriber"
  ]
}