curl --request POST \
  --url https://brew.new/api/contacts/import \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "contacts": [
    {
      "email": "john@example.com",
      "firstName": "John",
      "lastName": "Doe",
      "subscribed": true,
      "customFields": {
        "company": "Acme Inc",
        "role": "Developer"
      }
    },
    {
      "email": "jane@example.com",
      "firstName": "Jane",
      "lastName": "Smith"
    }
  ]
}
'

{
  "success": true,
  "data": {
    "importId": "<string>",
    "stats": {
      "total": 123,
      "valid": 123,
      "invalid": 123
    },
    "errors": [
      {
        "index": 123,
        "email": "<string>",
        "error": "<string>"
      }
    ]
  },
  "message": "<string>",
  "meta": {
    "requestId": "<string>"
  }
}