Hi guys. I will travel to Switzerland in the next few days. I bought a 2nd-class swiss travel pass (4 days, consecutive) and used it to reserve a 1st-class classic glacier express seat, from Zermatt to St. Moritz. ( I only paid seat fees CHF 39). I try to pay the upgrade fees on sbb.ch, and find two options, point-to-point class upgrade and day class upgrade, do both of them work on this route? Besides, I didn’t find the swiss travel pass among discounted options. Should I choose no-discount?