Get a portfolio's custom fields

{
    "data": [
        {
            "gid": "12345",
            "resource_type": "task",
            "custom_field": {
                "gid": "12345",
                "resource_type": "task",
                "display_value": "blue",
                "enabled": true,
                "enum_options": [
                    {
                        "gid": "12345",
                        "resource_type": "task",
                        "color": "blue",
                        "enabled": true,
                        "name": "Low"
                    }
                ],
                "name": "Status",
                "number_value": 5.2,
                "resource_subtype": "text",
                "text_value": "Some Value",
                "type": "text",
                "currency_code": "EUR",
                "custom_label": "gold pieces",
                "custom_label_position": "suffix",
                "description": "Development team priority",
                "format": "custom",
                "has_notifications_enabled": true,
                "is_global_to_workspace": true,
                "precision": 2,
                "created_by": {
                    "gid": "12345",
                    "resource_type": "task",
                    "name": "Greg Sanchez"
                },
                "enum_value": {
                    "gid": "12345",
                    "resource_type": "task",
                    "color": "blue",
                    "enabled": true,
                    "name": "Low"
                },
                "multi_enum_values": [
                    {
                        "gid": "12345",
                        "resource_type": "task",
                        "color": "blue",
                        "enabled": true,
                        "name": "Low"
                    }
                ]
            },
            "is_important": false,
            "parent": {
                "gid": "12345",
                "resource_type": "task",
                "name": "Stuff to buy"
            },
            "project": {
                "gid": "12345",
                "resource_type": "task",
                "name": "Stuff to buy"
            }
        }
    ]
}