{
  "emailId": 12345678,
  "message": {
    "to": "recipient@example.com",
    "from": "noreply@yourcompany.com",
    "sendId": "unique-send-id-123",
    "replyTo": [
      "support@yourcompany.com"
    ],
    "cc": [
      "jsmith@example.com"
    ],
    "bcc": [
      "jsmith@example.com"
    ]
  },
  "contactProperties": {
    "firstname": "John",
    "lastname": "Doe",
    "company": "Acme Corp"
  },
  "customProperties": {
    "order_number": "ORD-12345",
    "order_total": "$99.99"
  }
}