curl --request GET \
  --url https://tokens.flex.ai/v1/videos/generations/{id} \
  --header 'Authorization: Bearer <token>'

{
  "id": "<string>",
  "status": "queued",
  "created": 123,
  "completed": 123,
  "data": [
    {
      "b64_json": "<string>"
    }
  ],
  "error": {}
}