LineItem

{
    "quantity": 1,
    "price_data": {
        "product_data": {
            "name": "Premium Monthly Plan",
            "desc": "Unlimited access to all premium features"
        },
        "unit_amount": 99.99,
        "recurring": {
            "interval": "day",
            "unit_amount": "string",
            "interval_count": 1,
            "total_billing_cycles": 12
        }
    }
}