How do you report hours that vary week to week?, software tester here

My hours change every week at my new part-time job and I am afraid of reporting wrongly. I am in Buffalo, in case local advice matters. The form asks for gross earnings, which I do not see until later. Do you report when you earned it or when you were paid?

Keep everything in writing and save the confirmation numbers. It saved me later.

The claimant handbook has worked examples for part-time pay. Mine was clearer than the phone line.