Get a list of activity ID

But isn't the first query exactly what you need? You get a list of activities with IDs with some additional data. What would be different if you would get a list of only IDs?

@Jan_Mantauyes, the first query gives me all I need, but a lot more also, that will be duplicated after I query per ID, so I was wondering if there was a way to not have that many duplicated data.

@Lovroyes, I have all I need, but I was wondering if there was a way to avoid having the additional data at first, as all of it will be duplicated when I query per ID.

Just ignore the data in the first (list) query and use only IDs. Then only use data from the activity details and there will be no duplicates.

I understand that some data is received twice but that doesn't really matter does it? Do you have a very limited/slow connection where you must count every byte of the payload?

Yes, that's what I do, I ignore the data and focus on the ID, then I re-run the query using the ID.

I think it does matter to avoid wasting resources, which is why I asked.

I'm not particularly affected by the duplication of the data downloaded, but in the end, when millions of user query the API and get duplicate data that has to be thrown away before being re-downloaded, this is silly.