{
  "summary": "Bulk add subscribers to forms",
  "method": "POST",
  "path": "/v4/bulk/forms/subscribers",
  "tag": "Forms",
  "request_body": {
    "additions": [
      {
        "form_id": 1,
        "subscriber_id": 1,
        "referrer": "string"
      }
    ],
    "callback_url": "string"
  },
  "response": {
    "subscribers": [
      {
        "id": 1,
        "first_name": "string",
        "email_address": "string",
        "created_at": "string",
        "added_at": "string"
      }
    ],
    "failures": [
      {
        "errors": [
          null
        ],
        "subscription": {
          "form_id": null,
          "subscriber_id": null,
          "referrer": null
        }
      }
    ]
  }
}