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The region interface call method is new.
The example from the API doc https://docs.oracle.com/database/apex-18.2/AEXJS/region.html#call shows what the older equivalent way looks like.
Keep in mind that the getFilters method is not documented. In the code it has a comment: /*** FOR INTERNAL USE ONLY: Subject to change in the future, please do not use! ***/
This method will very likely change in the future, either be removed or changed to work differently, and your code will likely break. Be sure you or someone else is available to maintain this code in the future.
Also in the future we intend to have a PL/SQL API to get the filters similar to what you can do with IR.
Thanks for the helpful response.
Any idea on what sort of timescale we are looking at for the "official" way to get the filters? Just trying to establish whether we can wait until then or whether we need to implement an interim solution.