Verified stations are ones whose features and amenities are actively being kept up-to-date by the station operators.
How to identify a Verified Station
Verified stations stand out in the price list, with a little checkmark icon.
When you tap on the station in the price list, you see the Verified icon again, in the station details page.
When you tap on the Verified icon, while viewing the station details page, you get a full explanation of Verified stations.