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Python SDK for WeChat XPay (Virtual Payment) server-side APIs

Project description

微信支付虚拟支付 Python SDK

微信支付虚拟支付(XPay)服务端 API 的 Python SDK。

特性

  • 同步与异步 - 同时支持同步和异步操作
  • 类型提示 - 完整的类型注解支持
  • HTTP/2 - 基于 httpx,支持 HTTP/2
  • Webhook 解析 - 处理微信推送通知
  • 错误处理 - 完善的异常层次结构和错误码
  • 日志支持 - 可选的日志记录功能,便于调试

安装

pip install wechat-xpay

快速开始

同步客户端

from wechat_xpay import XPayClient

# 使用上下文管理器(推荐)
with XPayClient(
    app_id="你的_app_id",
    app_key="你的_app_key",
    env=0,  # 0=沙箱环境,1=生产环境
) as client:
    # access_token 和 session_key 在每次调用 API 时传入,因为它们都会定期过期
    balance = client.query_user_balance(
        openid="用户_openid",
        access_token="你的_access_token",
        session_key="用户_session_key",
    )
    print(f"余额: {balance.balance}")
    print(f"赠送余额: {balance.present_balance}")

异步客户端

import asyncio
from wechat_xpay import XPayAsyncClient

async def main():
    # 使用异步上下文管理器(推荐)
    async with XPayAsyncClient(
        app_id="你的_app_id",
        app_key="你的_app_key",
        env=0,
    ) as client:
        balance = await client.query_user_balance(
            openid="用户_openid",
            access_token="你的_access_token",
            session_key="用户_session_key",
        )
        print(f"余额: {balance.balance}")
        print(f"赠送余额: {balance.present_balance}")

asyncio.run(main())

为什么 access_token 和 session_key 要在每次调用时传入?

微信的 access_token(通过 auth.getAccessToken 获取)和 session_key(通过 auth.code2Session 获取)都有生命周期,会定期过期。

通过在每次 API 调用时传入而不是在客户端初始化时传入:

  • 你可以优雅地处理凭证过期,及时更新
  • 不同用户可以使用同一个客户端实例,各自使用自己的 access_tokensession_key
  • 你可以轮换凭证而无需重新创建客户端

API 覆盖

  • 用户代币管理 (query_user_balance, currency_pay, cancel_currency_pay, present_currency)
  • 订单管理 (query_order, refund_order)
  • 提现 (create_withdraw_order, query_withdraw_order, query_biz_balance)
  • 发货通知 (notify_provide_goods)
  • 广告金 (query_transfer_account, query_adver_funds, create_funds_bill, query_funds_bill, query_recover_bill, download_adverfunds_order, bind_transfer_account)
  • 道具管理 (start_upload_goods, query_upload_goods, start_publish_goods, query_publish_goods)
  • 投诉管理 (get_complaint_list, get_complaint_detail, response_complaint, complete_complaint, get_negotiation_history)
  • 文件上传 (upload_vp_file, get_upload_file_sign)
  • 账单下载 (download_bill)
  • Webhook 解析 (道具发货通知、代币支付通知、退款通知、用户投诉通知)

共计 29 个 API 端点,已全部实现。

使用示例

同步使用

from wechat_xpay import XPayClient

with XPayClient(
    app_id="wx1234567890",
    app_key="你的_app_key",
    env=0,
) as client:
    # 查询用户余额
    balance = client.query_user_balance(
        openid="用户_openid",
        access_token="你的_access_token",
        session_key="用户_session_key",
    )
    print(f"余额: {balance.balance}")
    print(f"赠送余额: {balance.present_balance}")

    # 处理支付
    result = client.currency_pay(
        openid="用户_openid",
        access_token="你的_access_token",
        session_key="用户_session_key",
        order_id="订单_123",
        amount=100,  # 代币数量
        payitem="商品描述",
    )
    print(f"订单 ID: {result.order_id}")

    # 退款
    result = client.refund_order(
        openid="用户_openid",
        access_token="你的_access_token",
        session_key="用户_session_key",
        refund_order_id="退款_123",
        left_fee=1000,
        refund_fee=500,
        refund_reason="1",  # 商品问题
        req_from="1",  # 人工
        order_id="原订单_id",
    )
    print(f"退款订单 ID: {result.refund_order_id}")

异步使用

import asyncio
from wechat_xpay import XPayAsyncClient

async def main():
    async with XPayAsyncClient(
        app_id="wx1234567890",
        app_key="你的_app_key",
        env=0,
    ) as client:
        # 查询用户余额
        balance = await client.query_user_balance(
            openid="用户_openid",
            access_token="你的_access_token",
            session_key="用户_session_key",
        )
        print(f"余额: {balance.balance}")

        # 并发处理多个支付(使用不同的 access_token / session_key)
        tasks = [
            client.currency_pay(
                openid=f"用户_{i}",
                access_token="你的_access_token",
                session_key=f"session_key_{i}",  # 每个用户有自己的 session_key
                order_id=f"订单_{i}",
                amount=100,
                payitem=f"商品_{i}",
            )
            for i in range(3)
        ]
        results = await asyncio.gather(*tasks)
        for result in results:
            print(f"订单 ID: {result.order_id}")

asyncio.run(main())

处理 Webhook

from wechat_xpay.webhook import WebhookParser

parser = WebhookParser()

# 解析 JSON 负载
notification = parser.parse({
    "Event": "xpay_goods_deliver_notify",
    "OpenId": "用户_openid",
    "OutTradeNo": "订单_123",
    # ... 其他字段
})

print(f"事件类型: {notification.event}")
print(f"用户 OpenID: {notification.open_id}")

# 返回成功响应给微信
response = parser.success_response()

错误处理

from wechat_xpay import XPayClient
from wechat_xpay.exceptions import XPayAPIError, ERR_SESSION_KEY_EXPIRED

client = XPayClient(...)

try:
    balance = client.query_user_balance(
        openid="用户_openid",
        access_token="你的_access_token",
        session_key="用户_session_key",
    )
except XPayAPIError as e:
    if e.errcode == ERR_SESSION_KEY_EXPIRED:
        print("会话已过期,请重新登录")
        # 重新授权用户获取新的 session_key
    else:
        print(f"API 错误: {e.errcode} - {e.errmsg}")

客户端生命周期管理

同步客户端

# 方式 1:上下文管理器(自动关闭)
with XPayClient(...) as client:
    result = client.query_user_balance(...)

# 方式 2:手动关闭
client = XPayClient(...)
try:
    result = client.query_user_balance(...)
finally:
    client.close()

异步客户端

# 方式 1:异步上下文管理器(自动关闭)
async with XPayAsyncClient(...) as client:
    result = await client.query_user_balance(...)

# 方式 2:手动关闭
client = XPayAsyncClient(...)
try:
    result = await client.query_user_balance(...)
finally:
    await client.close()

日志功能

SDK 支持可选的日志记录功能,可以记录所有 API 请求和响应信息,便于开发调试。

启用日志

import logging
from wechat_xpay import XPayClient

# 配置日志记录器
logger = logging.getLogger("wechat_xpay")
logger.setLevel(logging.DEBUG)

# 添加控制台处理器
console_handler = logging.StreamHandler()
console_handler.setLevel(logging.DEBUG)
formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
console_handler.setFormatter(formatter)
logger.addHandler(console_handler)

# 添加文件处理器(可选)
file_handler = logging.FileHandler("xpay.log", encoding="utf-8")
file_handler.setLevel(logging.DEBUG)
file_handler.setFormatter(formatter)
logger.addHandler(file_handler)

# 传入 logger 参数
with XPayClient(
    app_id="wx1234567890",
    app_key="your_app_key",
    env=0,
    logger=logger,  # 启用日志
) as client:
    balance = client.query_user_balance(
        openid="user_openid",
        access_token="your_access_token",
        session_key="user_session_key",
    )

日志内容

启用日志后,SDK 会记录:

  • 请求信息:API 端点、URL、请求参数(不包含敏感签名信息)
  • 响应信息:成功响应的数据
  • 错误信息:API 错误码和错误消息

日志级别:

  • DEBUG:记录所有请求和响应详情
  • ERROR:仅记录 API 错误

异步客户端日志

import logging
from wechat_xpay import XPayAsyncClient

logger = logging.getLogger("wechat_xpay")
logger.setLevel(logging.DEBUG)
handler = logging.StreamHandler()
handler.setFormatter(logging.Formatter('%(asctime)s - %(levelname)s - %(message)s'))
logger.addHandler(handler)

async with XPayAsyncClient(
    app_id="wx1234567890",
    app_key="your_app_key",
    env=0,
    logger=logger,
) as client:
    balance = await client.query_user_balance(
        openid="user_openid",
        access_token="your_access_token",
        session_key="user_session_key",
    )

不使用日志

如果不传入 logger 参数,SDK 不会记录任何日志(默认行为):

# 不传入 logger,不会记录日志
with XPayClient(
    app_id="wx1234567890",
    app_key="your_app_key",
    env=0,
) as client:
    balance = client.query_user_balance(
        openid="user_openid",
        access_token="your_access_token",
        session_key="user_session_key",
    )

认证

SDK 自动处理请求认证,所有签名通过 URL 查询参数传递:

  • access_token: 接口调用凭证,通过 auth.getAccessToken 获取,每次 API 调用时传入
  • pay_sig: 使用 AppKey 的 HMAC-SHA256 签名,所有接口都需要,SDK 自动计算
  • signature: 使用 session_key 的 HMAC-SHA256 用户态签名,仅 query_user_balancecurrency_pay 接口需要,SDK 自动判断并计算

URL 格式示例:

https://api.weixin.qq.com/xpay/{endpoint}?access_token=xxx&pay_sig=xxx
https://api.weixin.qq.com/xpay/{endpoint}?access_token=xxx&pay_sig=xxx&signature=xxx

签名工具函数

用于计算前端 wx.requestVirtualPaymentpaySigsignature 参数,可直接导入签名函数:

from wechat_xpay import calc_pay_sig, calc_signature

# 计算 pay_sig(支付签名)
# uri:
#       前端 wx.requestVirtualPayment 固定填 "requestVirtualPayment"
pay_sig = calc_pay_sig(
    uri="requestVirtualPayment",
    signData='{"offerId":"123","buyQuantity":1,"env":0,"currencyType":"CNY","productId":"testproductId","goodsPrice":10,"outTradeNo":"xxxxxx","attach":"testdata"}',
    appkey="你的_app_key",
)

# 计算 signature(用户态签名)
signature = calc_signature(
    signData='{"offerId":"123","buyQuantity":1,"env":0,"currencyType":"CNY","productId":"testproductId","goodsPrice":10,"outTradeNo":"xxxxxx","attach":"testdata"}',
    session_key="用户的_session_key",
)

注意signData 必须和前端调用wx.requestVirtualPayment传入的signData完全一致。

环境

  • env=0: 生产环境
  • env=1: 沙箱环境(用于测试)

文档

查看 docs/plans/ 目录了解实现细节和 API 规范。

许可证

MIT

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