API getting episode details returns different poster IDs

[ylatsj 2]

When I use API to get the details of an episode,  the API returns all sorts of IDs such as poster ID, cast&crew IDs. I found the first time I called the API it returned different IDs from the same API calls made after.  Wonder why it is like this?

And could anyone tell me what the naming rules are for the metadata library folders? I am trying to figure out the mapping measure between the folder names and my episodes. 

Thanks for any answers.

[Luke 42078]

Hi there, can you please provide a specific example? Thanks.