Two years ago I proposed introducing vending=ski_pass to tag ski pass vending machines. However, based on feedback in the discussion, particularly the suggestion to avoid adding overly specific vending=* values, I tend to agree that introducing a new value is probably unnecessary, as a ski pass is essentially an admission ticket granting access to ski lifts and pistes. This can already be expressed clearly with established tagging:
Several ski pass vending machines, particularly those used year-round that dispense not only winter ski passes but also summer single-ride aerialway tickets, are currently tagged as:
vending=public_transport_tickets
However, this does not seem appropriate. According to the Public transport → Cable cars, chair lifts, gondolas, etc. these are usually modelled with aerialway=* and are not part of the public transport tagging schema in typical leisure scenarios. They are often private services available only to customers of recreational facilities. Public transport tagging is intended for services like buses, trams, trains, ferries, etc.
To remove ambiguity, I suggest documenting whatever we agree on as the recommended pattern in the Pistes → Amenities and related sports section of the wiki and closing the original proposal.
While I am sure that you only need it for the lifts here in Switzerland (and probably all of Europe - except for some specially built areas (indoor and near cities)) I am not sure about the rest of the world.
In my ski-area I think (never checked it) you can only buy single-ride tickets in the vending-machines (but this might of course change), and part of the lifts are in fact public-transport. So by now they are perfectly fine as vending=public_transport_tickets.
In North America some ski resorts charge a fee just for trail (piste) access. It’s usually much cheaper than a lift ticket though. Here’s an example of a resort selling a nordic, backcountry, & uphill ticket that allows use of all their trails but only via human power (no lift access). Some resorts allow free uphill access to their downhill trails, but only outside of lift operating hours. Some don’t allow it at all. Policies vary from place to place.