基于Flask的python后端，组合支付记录，充值余额+赠送余额+微信支付功能实现详解

手里一个项目涉及到订单补差价的支付问题，记录下代码与逻辑
该系统基于Flask框架，并支持多种支付方式的组合，包括直接微信支付、充值账户余额支付和赠送账户余额支付。

本文将详细介绍这一差价支付功能的实现细节，代码主要包括四个部分：差价支付的主函数、三种组合支付的逻辑、余额组合支付的逻辑和充值余额支付的逻辑。

代码原文：

# 差价支付
def additional_payment_order_payment(user):from flask import requestdata = request.jsonorder_id = data.get('order_id')if not order_id:return reg_func(400, None, '订单id不能为空')add_pays = XOrderAdditionalPayment.query.filter_by(order_id=order_id,additional_payment_status='待支付',is_del=0).all()if not add_pays:return reg_func(400, None, '不存在补差信息')order = XOrder.query.filter_by(id=order_id).first()money = 0for item in add_pays:money += item.additional_payment_amount# 差价支付订单号 微信支付用related_order_number = random_order_number('B')# 充值余额recharge_amount = user.recharge_amount# 赠送余额bonus_amount = user.bonus_amount# 用户总余额all_amount = recharge_amount + bonus_amount# 直接微信支付if all_amount == 0:wx_pay = money * 100for item in add_pays:item.pay_order_number = related_order_numberdb.session.commit()return xcx_pay(user.wx_xcx_openid, int(wx_pay), related_order_number)# 如果充值余额足够支付elif recharge_amount >= money:return recharge_amount_pay(user, money, add_pays, order)# 如果余额足够支付elif all_amount >= money:return recharge_balance_and_bonus_payment(user, order, money, add_pays)else:return three_way_combination_payment(user, order, money, add_pays, related_order_number)# 余额不足，需要微信支付# 三种组合支付
def three_way_combination_payment(user, order, money, all_order, related_order_number):# 充值余额recharge_amount = user.recharge_amountbonus_amount = user.bonus_amount# 充值余额 有多少花多少if recharge_amount > 0:# 更新用户充值余额user.recharge_amount -= recharge_amountrecharge_amount_log = new_amount_log(user, recharge_amount, '充值账户','充值账户余额支付差价', order.order_type,order.order_number)# 增加支付记录db.session.add(recharge_amount_log)money -= recharge_amount# 充值账户的钱也干完if bonus_amount > 0:# 赠送账户扣款user.bonus_amount -= moneybonus_amount_log = new_amount_log(user, money, '赠送账户','赠送账户余额支付差价', order.order_type,order.order_number)db.session.add(bonus_amount_log)# 剩下的 微信支付来wx_pay = money * 100for item in all_order:item.pay_order_number = related_order_numberdb.session.commit()return xcx_pay(user.wx_xcx_openid, int(wx_pay), related_order_number)# 余额组合支付
def recharge_balance_and_bonus_payment(user, order, money, all_order):# 充值余额recharge_amount = user.recharge_amount# 充值余额 有多少花多少if recharge_amount > 0:# 更新用户充值余额user.recharge_amount -= recharge_amountrecharge_amount_log = new_amount_log(user, recharge_amount, '充值账户','充值账户余额支付差价', order.order_type,order.order_number)# 增加支付记录db.session.add(recharge_amount_log)money -= recharge_amount# 赠送账户扣款user.bonus_amount -= moneybonus_amount_log = new_amount_log(user, money, '赠送账户','赠送账户余额支付差价', order.order_type,order.order_number)db.session.add(bonus_amount_log)for item in all_order:item.additional_payment_status = '已支付'item.additional_payment_time = datetime.now()item.additional_payment_method = '余额支付'try:db.session.commit()return reg_func(200, None, '支付成功')except SQLAlchemyError as e:return reg_func(400, str(e), f'支付失败：请重试')# 赠送余额支付金额# bonus_amount_spay -= recharge_amount_pay# 充值余额支付
def recharge_amount_pay(user, money, all_order, order):# 修改用户充值余额账户user.recharge_amount -= moneynew_log = new_amount_log(user, money, '充值账户', '充值账户余额支付差价',order.order_type,order.order_number)db.session.add(new_log)for item in all_order:item.additional_payment_status = '已支付'item.additional_payment_time = datetime.now()item.additional_payment_method = '余额支付'try:db.session.commit()return reg_func(200, None, '支付成功')except SQLAlchemyError as e:return reg_func(400, str(e), f'支付失败：请重试')

详细介绍：由GPT协助撰稿

详细介绍文章

概述

在电子商务和在线交易平台中，用户常常会遇到需要补交差价的情况。为了优化用户体验，我们设计并实现了一套灵活的差价支付系统。该系统基于Flask框架，支持多种支付方式，包括直接微信支付、充值账户余额支付和赠送账户余额支付等多种组合支付方式。

本篇文章将详细介绍这一差价支付功能的实现，包括每个函数的功能和实现逻辑，以及在实际应用中的优势和可扩展性。

系统设计思路

差价支付系统的设计旨在满足以下几个关键需求：

多种支付方式的灵活组合：用户可以使用不同的支付方式组合来完成差价支付，确保用户在支付时有多种选择。
便捷的支付流程：系统自动判断用户账户余额和支付需求，提供最佳的支付方式，简化支付流程。
安全性和可靠性：通过Flask和SQLAlchemy，确保数据的安全性和支付流程的可靠性。

代码实现

下面是差价支付系统的详细代码实现，包括四个主要部分：差价支付主函数、三种组合支付的逻辑、余额组合支付的逻辑和充值余额支付的逻辑。

1. 差价支付主函数

additional_payment_order_payment函数是整个支付流程的入口。它负责处理用户的差价支付请求，首先从请求数据中提取订单ID，并检查是否存在未支付的补差信息。如果用户的余额不足以支付差价，系统会生成一个新的微信支付订单号，并根据用户的余额情况选择适当的支付方式。

def additional_payment_order_payment(user):from flask import requestdata = request.jsonorder_id = data.get('order_id')if not order_id:return reg_func(400, None, '订单id不能为空')add_pays = XOrderAdditionalPayment.query.filter_by(order_id=order_id,additional_payment_status='待支付',is_del=0).all()if not add_pays:return reg_func(400, None, '不存在补差信息')order = XOrder.query.filter_by(id=order_id).first()money = 0for item in add_pays:money += item.additional_payment_amountrelated_order_number = random_order_number('B')recharge_amount = user.recharge_amountbonus_amount = user.bonus_amountall_amount = recharge_amount + bonus_amountif all_amount == 0:wx_pay = money * 100for item in add_pays:item.pay_order_number = related_order_numberdb.session.commit()return xcx_pay(user.wx_xcx_openid, int(wx_pay), related_order_number)elif recharge_amount >= money:return recharge_amount_pay(user, money, add_pays, order)elif all_amount >= money:return recharge_balance_and_bonus_payment(user, order, money, add_pays)else:return three_way_combination_payment(user, order, money, add_pays, related_order_number)

功能说明：

订单ID校验：从请求数据中获取订单ID，检查是否为空。
查询未支付的补差信息：从数据库中查询所有未支付的补差记录。
计算应支付的总金额：遍历所有未支付记录，计算需要支付的总金额。
选择支付方式：根据用户的余额情况，选择合适的支付方式：
- 如果用户没有任何余额，则直接通过微信支付。
- 如果用户的充值余额足够支付，则使用充值余额支付。
- 如果用户的总余额（充值余额+赠送余额）足够支付，则使用余额组合支付。
- 如果余额不足，则进行三种支付方式的组合支付。

2. 三种组合支付

three_way_combination_payment函数处理当用户的总余额不足以支付差价时的情况。系统会优先使用充值余额支付，再使用赠送余额支付，最后剩余部分通过微信支付来完成。

def three_way_combination_payment(user, order, money, all_order, related_order_number):recharge_amount = user.recharge_amountbonus_amount = user.bonus_amountif recharge_amount > 0:user.recharge_amount -= recharge_amountrecharge_amount_log = new_amount_log(user, recharge_amount, '充值账户','充值账户余额支付差价', order.order_type,order.order_number)db.session.add(recharge_amount_log)money -= recharge_amountif bonus_amount > 0:user.bonus_amount -= moneybonus_amount_log = new_amount_log(user, money, '赠送账户','赠送账户余额支付差价', order.order_type,order.order_number)db.session.add(bonus_amount_log)wx_pay = money * 100for item in all_order:item.pay_order_number = related_order_numberdb.session.commit()return xcx_pay(user.wx_xcx_openid, int(wx_pay), related_order_number)

功能说明：

优先使用充值余额：如果用户有充值余额，系统会首先使用充值余额支付，并记录相关的支付日志。
使用赠送余额支付剩余部分：如果用户还有未支付的金额，则使用赠送余额支付，并记录支付日志。
微信支付剩余金额：如果余额仍然不足，剩余的金额通过微信支付来完成，确保整个支付过程的顺利进行。

3. 余额组合支付

recharge_balance_and_bonus_payment函数在用户的充值余额和赠送余额合计足够支付差价时使用。它优先使用充值余额支付，剩余部分由赠送余额支付。

def recharge_balance_and_bonus_payment(user, order, money, all_order):recharge_amount = user.recharge_amountif recharge_amount > 0:user.recharge_amount -= recharge_amountrecharge_amount_log = new_amount_log(user, recharge_amount, '充值账户','充值账户余额支付差价', order.order_type,order.order_number)db.session.add(recharge_amount_log)money -= recharge_amountuser.bonus_amount -= moneybonus_amount_log = new_amount_log(user, money, '赠送账户','赠送账户余额支付差价', order.order_type,order.order_number)db.session.add(bonus_amount_log)for item in all_order:item.additional_payment_status = '已支付'item.additional_payment_time = datetime.now()item.additional_payment_method = '余额支付'try:db.session.commit()return reg_func(200, None, '支付成功')except SQLAlchemyError as e:return reg_func(400, str(e), f'支付失败：请重试')

功能说明：

优先使用充值余额：系统会首先使用用户的充值余额支付，并记录支付日志。
使用赠送余额支付剩余部分：如果充值余额不足，则使用赠送余额支付剩余部分，并更新支付状态。
处理支付异常：如果支付过程中发生异常，系统会捕获并返回错误信息，确保用户能够及时了解支付情况。

4. 充值余额支付

recharge_amount_pay函数在用户的充值余额足以支付差价的情况下使用。它会直接从充值余额中扣除相应的金额，并更新相关支付记录。

def recharge_amount_pay(user, money, all_order, order):user.recharge_amount -= moneynew_log = new_amount_log(user, money, '充值账户', '充值账户余额支付差价',order.order_type,order.order_number)db.session.add(new_log)for item in all_order:item.additional_payment_status = '已支付'item.additional_payment_time = datetime.now()item.additional_payment_method = '余额支付'try:db.session.commit()return reg_func(200, None, '支付成功')except SQLAlchemyError as e:return reg_func(400, str(e), f'支付失败：请重试')