{
  "$schema": "https://json-structure.org/draft/2020-12/schema",
  "name": "CampaignRecipient",
  "type": "object",
  "properties": {
    "email": {
      "type": "string"
    },
    "lead_id": {
      "type": "['integer', 'null']"
    },
    "sending_status": {
      "type": "string"
    }
  }
}