Wage reporting when hours change weekly - what worked for you?

My hours change every week at my new part-time job and I am afraid of reporting wrongly. Pay posts on a different day from when I work. Did anyone get an overpayment notice from a mistake?

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.