billing.PlanSwitchPreview

{
    "amount_to_charge": 0,
    "balance_after": 0,
    "credit_difference": 0,
    "current_balance": 0,
    "current_plan": {
        "credits": 0,
        "id": "string",
        "name": "string",
        "price": 0
    },
    "is_upgrade": true,
    "new_plan": {
        "credits": 0,
        "id": "string",
        "name": "string",
        "price": 0
    },
    "new_plan_charge": 0,
    "remaining_days": 0,
    "total_days": 0,
    "unused_credit": 0
}