My use case involves an external content creation system which generates JSON and sends it to GameSparks, where it is processed and stored in MongoDB. I could have the tool call a custom event using the REST API to do the data processing, but without a playerId it fails with an "NOTAUTHORIZED" error. Is it advisable to use Cloud Code events for tasks which don't directly relate to one particular user? 

I know I could use the NoSQL REST APIs to do everything externally, but the data processing would be much easier to do in Cloud Code. 

Is there a better way to run some custom logic on GameSparks for my use case?

Thanks.

Okay. I just found the callbacks tutorial. I have to say that I was surprised to read that callbacks are scripts on GameSparks that you can call from an external server. I think that solves my problem though. 

We use the Gamesparks callback functionality to do exactly what you are trying to do..

https://docs.gamesparks.com/tutorials/cloud-code-and-the-test-harness/implementing-external-http-callbacks.html

https://docs.gamesparks.com/tutorials/cloud-code-and-the-test-harness/using-custom-callback-urls.html