This is probably a stupid question and you don't have to mention it.
I get my upc cablecom bill in pdf format via email. (I used to get an orange "bulletin de versement" but now I only get the pdf bill). I try to pay it online via my PostFinance e-finance tool. PostFinance asks for the "numéro de référence". Where is that number on my upc cablecom bill? And why is it not clearly indicated on the upc cablecom bill? (It was clearly indicated on the orange "bulletin de versement").