I am using the at.js library and following use case. (Changed for understanding). I am using the getOffer and want a variable key in the params. I did it with the code and it works fine. The problem is that I need this code in Adobe DTM. And pasted in the editor I get an Error "Unexpected Token for [" -> that means the brackets can't be used. But for me there is no real go around for that. It's normal vanilla js so I do not understand the problem.