{
  "bsonType": "object",
  "encryptMetadata": {
    "keyId": [
      {
        "$binary": {
          "base64": "<paste_your_key_id_here>",
          "subType": "04"
        }
      }
    ]
  },
  "properties": {
    "insurance": {
      "bsonType": "object",
      "properties": {
        "policyNumber": {
          "encrypt": {
            "bsonType": "int",
            "algorithm": "AEAD_AES_256_CBC_HMAC_SHA_512-Deterministic"
          }
        }
      }
    },
    "medicalRecords": {
      "encrypt": {
        "bsonType": "array",
        "algorithm": "AEAD_AES_256_CBC_HMAC_SHA_512-Random"
      }
    },
    "bloodType": {
      "encrypt": {
        "bsonType": "string",
        "algorithm": "AEAD_AES_256_CBC_HMAC_SHA_512-Random"
      }
    },
    "ssn": {
      "encrypt": {
        "bsonType": "int",
        "algorithm": "AEAD_AES_256_CBC_HMAC_SHA_512-Deterministic"
      }
    }
  }
}