eBay XML Api - list an item with Overnight free shipping

Question

I'm trying to list an item with global free shipping via the eBay API, I'm having issues figuring out the exact parameters to the ShippingDetails. I have attached images of what I'm trying to achieve in a listing and the XML that I am using at the moment, note that I am getting Input data is invalid. Input data for tag <Item.ShippingDetails> is invalid or missing. Please check API documentation' At the moment.

XML Data:

def list_new_item():
    response = api.execute('AddFixedPriceItem', {
        'Item': {
            'Title': 'Random book',
            'Description': 'This is a random book item',
            'PrimaryCategory': {'CategoryID': '38583'},
            'StartPrice': '1.0',
            'CategoryMappingAllowed': 'true',
            'ConditionID': '1000',
            'Country': 'US',
            'Currency': 'USD',
            'DispatchTimeMax': '3',
            'ListingDuration': 'Days_30',
            'ListingType': 'FixedPriceItem',
            'PictureDetails': {
                'PictureURL': ['https://example.com']
            },
            "Location": "Calexico, California",
            'Quantity': '0',
            "ShippingDetails": {
                "ShippingServiceOptions": [
                    {
                        "ShippingServicePriority": 1,
                        "ShippingService": "Overnight",
                        "ShippingServiceCost": "0.00",
                        "FreeShipping": True,
                        "ShippingTimeMax": 1
                    }
                ]
                        },
            'ReturnPolicy': {
                'ReturnsAcceptedOption': 'ReturnsNotAccepted'
            }
        }
    })

    return response.dict()