参考链接：https://github.com/fzlee/alipay
支付宝沙箱环境：https://openhome.alipay.com/platform/appDaily.htm?tab=account
手机网站支付：https://docs.open.alipay.com/203/107090/

业务场景：实现租房小程序，用户下单和订单保存功能

1、安装以下包：

pip install python-alipay-sdk --upgrade

2、flask实现

# coding:utf-8
from ihome.base import db
from . import api
from ihome.utils.commons import login_required
from ihome.models import Order
from flask import g, current_app, jsonify, request
from ihome.utils.response_code import RET
from alipay import AliPay
from ihome import constants


@api.route("/orders/<int:order_id>/payment", methods=["POST"])
@login_required
def order_pay(order_id):
    """发起支付宝支付"""
    user_id = g.user_id
    try:
        order = Order.query.filter(Order.id == order_id, Order.user_id == user_id,
                                   Order.status == "WAIT_PAYMENT").first_or_404()
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg="数据库异常")

    if order is None:
        return jsonify(errno=RET.NODATA, errmsg="订单数据有误")
    app_private_key_string = open(r"D:\ihome\v1\keys\app_private_key.pem").read()
    alipay_public_key_string = open(r"D:\ihome\v1\keys\alipay_public_key.pem").read()
    alipay = AliPay(
        appid="你的appid",
        app_notify_url=None,
        app_private_key_string=app_private_key_string,
        alipay_public_key_string=alipay_public_key_string,
        sign_type="RSA2",
        debug=False
    )
    order_string = alipay.api_alipay_trade_wap_pay(
        out_trade_no=order.id,
        total_amount=str(order.amount/100.0),
        subject="爱家 %s" % order.id,
        return_url="http://127.0.0.1:8000/payComplete.html",
        notify_url=None
    )
    pay_url = constants.ALIPAY_URL_PREFIX + order_string
    return jsonify(errno=RET.OK, errmsg="OK", data={"pay_url": pay_url})


@api.route("/order/payment", methods=["PUT"])
def save_order_payment_result():
    """保存订单支付结果"""
    data = request.form.to_dict()
    # sign must be poped out
    signature = data.pop("sign")
    app_private_key_string = open(r"D:\ihome\v1\keys\app_private_key.pem").read()
    alipay_public_key_string = open(r"D:\ihome\ihome\v1\keys\alipay_public_key.pem").read()

    alipay = AliPay(
        appid="你的appid",
        app_notify_url=None,
        app_private_key_string=app_private_key_string,
        alipay_public_key_string=alipay_public_key_string,
        sign_type="RSA2",
        debug=False
    )

    success = alipay.verify(data, signature)

    if success:
        order_id = data.get("out_trade_no")
        trade_no = data.get("trade_no")
        try:
            with db.auto_commit():
                order = Order.query.get(order_id)
                order.status = "WAIT_COMMENT"
                order.trade_no = trade_no
                db.session.add(order)
                print('更新成功！')
        except Exception as e:
            current_app.logger.error(e)

    return jsonify(errno=RET.OK, errmsg="OK")

3、遇到问题

①在支付测试中，记得保证每次的out_trade_no不同，如果重复会报“操作频繁，请稍后重试”