{
  "type": "object",
  "properties": {
    "send_receipt": {
      "type": "boolean",
      "description": "The requested receipt preference, if supplied."
    },
    "channel": {
      "enum": [
        "email",
        "sms"
      ],
      "description": "The channel associated with the receipt preference."
    }
  },
  "required": [],
  "additionalProperties": false,
  "dependentRequired": {
    "send_receipt": [
      "channel"
    ]
  }
}