来源：https://blog.csdn.net/weixin_45394086
为什么使用三方支付？
再没有三方支付平台之前，用户发起支付请求的时候，用户要去和银行签约(转账)，特别的不方便，为了解决这些问题，就有了三方支付，三方平台去完成签约，给用户节省时间。
支付宝支付的流程
商户拿到支付宝的公钥、自己的私钥（私钥加密、公钥解密），用私钥请求支付宝，支付宝解密、验签、进行支付处理，支付宝将处理的返回值传给商户，当支付成功后，返还给商户订单号、金额、时间戳等消息，支付失败后同样给商户反馈结果。
配置流程
1、获取APPID
支付宝开放平台:https://open.alipay.com/
2、在线生成密钥
3、获取公钥
现在已经拿到了需要的公钥。
Python项目中集成支付宝
from datetime import datetimefrom Crypto.PublicKey import RSAfrom Crypto.Signature import PKCS1_v1_5from Crypto.Hash import SHA256from urllib.parse import quote_plusfrom base64 import decodebytes, encodebytesimport json
class AliPay: """ 支付宝支付接口(PC端支付接口) """
def __init__(self, appid, app_notify_url, app_private_key_path, alipay_public_key_path, return_url, debug=False): self.appid = appid self.app_notify_url = app_notify_url self.app_private_key_path = app_private_key_path self.app_private_key = None self.return_url = return_url with open(self.app_private_key_path) as fp: self.app_private_key = RSA.importKey(fp.read()) self.alipay_public_key_path = alipay_public_key_path with open(self.alipay_public_key_path) as fp: self.alipay_public_key = RSA.importKey(fp.read())
if debug is True: self.__gateway = "https://openapi.alipaydev.com/gateway.do" else: self.__gateway = "https://openapi.alipay.com/gateway.do"
def direct_pay(self, subject, out_trade_no, total_amount, return_url=None, **kwargs): biz_content = { "subject": subject, "out_trade_no": out_trade_no, "total_amount": total_amount, "product_code": "FAST_INSTANT_TRADE_PAY", }
biz_content.update(kwargs) data = self.build_body("alipay.trade.page.pay", biz_content, self.return_url) return self.sign_data(data)
def build_body(self, method, biz_content, return_url=None): data = { "app_id": self.appid, "method": method, "charset": "utf-8", "sign_type": "RSA2", "timestamp": datetime.now().strftime("%Y-%m-%d %H:%M:%S"), "version": "1.0", "biz_content": biz_content }
if return_url is not None: data["notify_url"] = self.app_notify_url data["return_url"] = self.return_url
return data
def sign_data(self, data): data.pop("sign", None) unsigned_items = self.ordered_data(data) unsigned_string = "&".join("{0}={1}".format(k, v) for k, v in unsigned_items) sign = self.sign(unsigned_string.encode("utf-8")) quoted_string = "&".join("{0}={1}".format(k, quote_plus(v)) for k, v in unsigned_items)
signed_string = quoted_string + "&sign=" + quote_plus(sign) return signed_string
def ordered_data(self, data): complex_keys = [] for key, value in data.items(): if isinstance(value, dict): complex_keys.append(key)
for key in complex_keys: data[key] = json.dumps(data[key], separators=(',', ':'))
return sorted([(k, v) for k, v in data.items()])
def sign(self, unsigned_string): key = self.app_private_key signer = PKCS1_v1_5.new(key) signature = signer.sign(SHA256.new(unsigned_string)) sign = encodebytes(signature).decode("utf8").replace("\n", "") return sign
def _verify(self, raw_content, signature): key = self.alipay_public_key signer = PKCS1_v1_5.new(key) digest = SHA256.new() digest.update(raw_content.encode("utf8")) if signer.verify(digest, decodebytes(signature.encode("utf8"))): return True return False
def verify(self, data, signature): if "sign_type" in data: data.pop("sign_type") unsigned_items = self.ordered_data(data) message = "&".join(u"{}={}".format(k, v) for k, v in unsigned_items) return self._verify(message, signature)
def init_alipay(): # 初始化Alipay alipay = AliPay( appid="appid", app_notify_url="回调地址", return_url="回调地址", app_private_key_path="私钥相对路径", alipay_public_key_path="公钥相对路径", debug=True # 支付环境 ) return alipay
async def get(self): alipay = init_alipay() # 传一个标题 订单号 订单价格 params = alipay.direct_pay("三方广告平台", order_no, money) url = f"https://openapi.alipaydev.com/gateway.do?{params}" return self.write(ret_json(url))
# 构建一个回调地址,用于支付成功后回调,在回调地址中可以获取订单号(out_trade_no)、金额(total_amount)、时间戳(timestamp),然后进行处理业务逻辑。
总结
支付包有自己的接口文档，以上是我在Python环境下配置的，可以直接使用。
