from pydantic import BaseModel class RechargeRequest(BaseModel): plan: str # package id method: str = "wechat" # "wechat" or "alipay" class PaymentOrderOut(BaseModel): id: str order_no: str amount: float credits: float payment_method: str status: str qr_url: str | None = None # Alipay QR code URL (transient, not persisted) model_config = {"from_attributes": True}