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pip install flask-weixin-pay

easy_install flask-weixin-pay

from flask_weixin_pay import WeixinPay, WeixinPayError

wxpay = WeixinPay()
wxpay.init(app)

config = {
    "WEIXIN_APP_ID": "wxapp_id",
    "WEIXIN_MCH_ID": "100000010",
    "WEIXIN_MCH_KEY": "128bad2e99a79312e25b2c162c9bab34",
    "WEIXIN_NOTIFY_URL": "http://www.example.com/pay/weixin/notify",
}
wxpay = WeixinPay(config)

out_trade_no = wx_pay.nonce_str
try:
    raw = wx_pay.unified_order(openid="orU79wrXdrgNRNEZmoFD97rxGkb0", trade_type="JSAPI", body=u"测试", out_trade_no=out_trade_no, total_fee=1)
    print raw["prepay_id"]
except WeixinPayError, e:
    print e.message

raw = wx_pay.order_query(out_trade_no=out_trade_no)

raw = wx_pay.close_order(out_trade_no)

// total_fee 单位为分
print wx_pay.jsapi(openid="orU79wrXdrgNRNEZmoFD97rxGkb0", body=u"测试", out_trade_no=out_trade_no, total_fee=1)

wx_pay.sign(dict(openid="123"))

wx_pay.nonce_str

wx_pay.check(dict(openid="123", sign="SIGN"))