Even while I am Dutch I will post in English as almost every Bunq answer I see is in English.
Would it be possible to have Bunq request the terminal at the tankstation for your current "kilometerstand"? When this additional information along with the product info that can be collect (like product, amount and total cost) would be available through the api as enriched data.
This way drivers could gain automatically more insight in fuel usage.
I would appreciate it very much.