Gst for commission agents who import for direct end user

Dear sir or madam,

I am importer of machineries. I supply machineries to END user by importing them from foreign contries. All the machineries are imported on the name of END user. Supplier company collects the commission from END user and pays me as per my terms. My commision is never disclosed to the END user. Am I liable to Register Under GST? If yes, how will I show this transaction?

Regards