appendFields

Parameter Name	Type	Mandatory or Optional	Description
key	String	Mandatory	Field ID. This ID must be unique across all pass objects.
value	String	Mandatory	Field value.
label	String	Mandatory	Field label.
localizedLabel	String	Optional	Indicates whether the label parameter is localized. If it is, set localizedLabel to the key parameter value of the localized field. If you do not set localizedLabel, the label parameter value will be used.
localizedValue	String	Optional	Indicates whether the value parameter is localized. If it is, set localizedLabel to the key parameter value of the localized field. If you do not set localizedLabel, the value parameter value will be used.

Example

{
    "appendFields": [
        {
            "key": "Color",
            "value": "#483d8b",
            "label": "Color"
        }
    ]
}