Help to get the id details for parameters - api using wql query

Having a mare at work.

I’m a data engineer trying to get data out of a data source.

I’ve worked out how the filters work and the parameters BUT I cannot for the life of me work out how to find out what the ids represent.

I’m starting with a wql query taken from using to convert to wql query and it contains ids. So parameters x = 54321 BUT I want to access the data to find what 54321 represents ie. GBP and what others are available eg. 54345 = NZD.

There is no clear data source to get these from.

Where should I even start?

Help!