curl --request POST \
  --url https://api.pandabase.io/v2/core/stores/{storeId}/cases/{caseId}/messages \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "body": "<string>",
  "attachments": [
    {}
  ]
}
'

{
  "ok": true,
  "data": {
    "id": "<string>",
    "senderType": "CUSTOMER",
    "senderId": "<string>",
    "body": "<string>",
    "createdAt": "2023-11-07T05:31:56Z",
    "attachments": [
      {
        "id": "<string>",
        "filename": "<string>",
        "mimeType": "<string>",
        "sizeBytes": 123
      }
    ]
  }
}