Oct 6, 2019 - 8:06 AM
this is normal. The credit card reserves 150 chf on starting to pump to allow you to fill up and to make sure you have enough credit. Similar as the hotels do to make sure you do not rob the mini bar.
The actual amount is what the pump shows when you finished.
On new card like revolut you instantly see this, with the traditional monthly bill, this would go unnoticed.
Traveling Switzerland by train saves you from such surprises ;-)
Have a nice trip.