@openstreetmap/id-tagging-schema/data/fields/charge_fee.json

The OpenStreetMap tagging model used by the iD editor

{
    "key": "charge",
    "type": "text",
    "label": "Fee Amount",
    "placeholder": "1 EUR, 5 USD, 10 JPY…",
    "prerequisiteTag": {
        "key": "fee",
        "valueNot": "no"
    }
}