How to map a variable associated to a trigger

Hello,

I would like to map the ID of a record associated to a trigger (when a task is updated, for example).

To do this ,

- I have builded a custom function associated to the module "Tasks".

- I use the getJson Deluge function on the argument "task" which is a map typ.

- I configure a workflow rule which integrates the trigger and the custom function.

When I test, I manage to retrieve the content of the "task" argument.

But extracting the record ID using the getJson function doesn't work:

Any Help would be appreciated.

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