curl --request GET \
  --url https://api.migma.ai/v1/emails/previews/{previewId} \
  --header 'Authorization: Bearer <token>'

{
  "success": true,
  "data": {
    "previewId": "<string>",
    "status": "<string>",
    "previewData": {
      "previews": [
        {
          "deviceKey": "<string>",
          "deviceName": "<string>",
          "imageUrl": "<string>",
          "thumbnailUrl": "<string>"
        }
      ]
    }
  }
}