How to send parameters to invocable method from custom apex functions

I am trying to call an apex function using “Run Custom Apex Action” , i am successfully calling the function but not able to pass parameters to the function.

I have a model called application i have to pass the application models id , need some approaches to send id as an attribute.

when i am trying to pass parameters as {{Application.id}} getting null in apex function.

Are you sure that case sensitivity is correct?   Usually its “Id”  not “id”