支付宝-单笔转账接口

前言：支付宝的这个接口有什么用呢？主要是方便支付宝商家转账给其他用户，因为都是支付宝内部自己数据库转来转去，所以现在都是免费的，不用手续费。这样对商家来说省钱又便捷。

1.申请企业商户。

2.签约支付宝单笔转账产品接口。(1)登录alipay.com选择支付宝商家->(2)顶部导航选产品中心->(3)拉到底部找到资金服务->(4)选择转账到支付宝->(5)立即开通->(6)等待官方审核

(1)(2)

(3)(4)

(5)

 3.先看官方接口文档：https://opendocs.alipay.com/apis/api_28/alipay.fund.trans.uni.transfer，我用的是新版的转账支到支付宝账户接口。

 4.申请(1)应用公钥证书，(2)支付宝公钥证书，(3)支付宝根证书。要获取这3个证书先下载个支付宝开放平台开发助手，下载地址https://opendocs.alipay.com/open/291/introduce

 下载完用支付宝商户扫码登录进去。

(1)应用公钥证书获取：如下图(1)红色圈1，2，3，4，5，6步骤选择。红色圈3是因为我用.net core开发。图2的红色圈2一定要选择对了，不然到时候对接会显示RSA私钥有问题。图(1)、图(2)都弄完会生成拓展名为csr文件，点击图(3)的红色圈1上传上去，弹出登录界面和短信验证码界面，验证通过后到如图(4)界面点击红色圈1弹出如图(5)界面。在如图(5)界面上传前面生成的csr文件即可得到：(1)应用公钥证书、(2)支付宝公钥证书、(3)支付宝根证书。

图(1)

图(2)

 图(3)

图(4)

 如图(5)

 5.上对接代码。

    public class AlipayResponse
    {
        /// <summary>
        /// 网关返回码，10000代表成功，其他都是失败。API公共错误码对照地址：https://opendocs.alipay.com/open/common/105806
        /// </summary>
        public string code { get; set; }
        /// <summary>
        /// 网关返回码描述
        /// </summary>
        public string msg { get; set; }
        /// <summary>
        /// 业务返回码
        /// </summary>
        public string sub_code { get; set; }
        /// <summary>
        /// 业务返回码描述
        /// </summary>
        public string sub_msg { get; set; }
        /// <summary>
        /// 签名
        /// </summary>
        public string sign { get; set; }
        /// <summary>
        /// 商户订单号，示例值：201808080001
        /// </summary>
        public string out_biz_no { get; set; }
        /// <summary>
        /// 支付宝转账订单号，示例值：20190801110070000006380000250621
        /// </summary>
        public string order_id { get; set; }
        /// <summary>
        /// 支付宝支付资金流水号,示例值：20190801110070001506380000251556
        /// </summary>
        public string pay_fund_order_id { get; set; }
        /// <summary>
        /// 转账单据状态。
        /// SUCCESS：成功（对转账到银行卡的单据, 该状态可能变为退票[REFUND] 状态）；
        /// FAIL：失败（具体失败原因请参见error_code以及fail_reason返回值）；
        /// DEALING：处理中；
        /// REFUND：退票；
        /// </summary>
        public string status { get; set; }
        /// <summary>
        /// 订单支付时间，格式为yyyy-MM-dd HH:mm:ss,示例值：2019-08-21 00:00:00
        /// </summary>
        public string trans_date { get; set; }
    }

    public class PaymentService
    {
        /// <summary>
        /// 单笔转账接口
        /// </summary>
        /// <param name="out_biz_no">订单号</param>
        /// <param name="trans_amount">订单金额</param>
        /// <param name="order_title">交易描述</param>
        /// <param name="alipay_account">支付账号</param>
        /// <param name="real_name">支付宝真实姓名</param>
        /// <param name="remark">描述</param>
        /// <returns></returns>14         public AlipayResponse Payment(string out_biz_no, decimal trans_amount, string order_title, string alipay_account, string real_name, string remark)
        {
            var SIGN_TYPE = "RSA2";//签名方式
            var CHARSET = "UTF-8";//编码格式
            var APP_ID = "xxxxxxxxx";//应用appid
            var PRIVATE_KEY = "xxxxxxxx";//这个是生成csr文件时候一起生成的私钥
            var ALIPAY_GATEWAY = "https://openapi.alipay.com/gateway.do";//请求网关地址
            var certParams = new CertParams
            {
                AlipayPublicCertPath = Environment.CurrentDirectory + "\Crt\alipayCertPublicKey_RSA2.crt",//支付宝公钥证书绝对路径
                AppCertPath = Environment.CurrentDirectory + "\Crt\appCertPublicKey_2021001173604283.crt",//应用公钥证书绝对路径
                RootCertPath = Environment.CurrentDirectory + "\Crt\alipayRootCert.crt"//支付宝根证书
            };
            var client = new DefaultAopClient(ALIPAY_GATEWAY, APP_ID, PRIVATE_KEY, "json", "1.0", SIGN_TYPE, CHARSET, "false", certParams);
            var request = new AlipayFundTransUniTransferRequest
            {
                BizContent = "{" +
                //商户端的唯一订单号，对于同一笔转账请求，商户需保证该订单号唯一
                ""out_biz_no":"" + out_biz_no + ""," +
                ""trans_amount":" + trans_amount + "," +
                ""product_code":"TRANS_ACCOUNT_NO_PWD"," +
                ""biz_scene":"DIRECT_TRANSFER"," +
                ""order_title":"" + order_title + ""," +
                ""payee_info":{" +
                ""identity":"" + alipay_account + ""," +
                ""identity_type":"ALIPAY_LOGON_ID"," +
                ""name":"" + real_name + """ +
                "}," +
                ""remark":"" + remark + """ +
                "}"
            };

            var response = client.CertificateExecute(request);
            AlipayResponse alipayResponse = new AlipayResponse();
            if (response.Code == "10000")
            {
                alipayResponse.code = response.Code;//网关返回码
                alipayResponse.msg = response.Msg;//网关返回码描述
                alipayResponse.sub_code = "";//业务返回码
                alipayResponse.sub_msg = "";//业务返回码描述
                alipayResponse.out_biz_no = response.OutBizNo;//商户订单号
                alipayResponse.order_id = response.OrderId;//支付宝转账订单号
                alipayResponse.pay_fund_order_id = response.PayFundOrderId;//支付宝支付资金流水号
                alipayResponse.status = response.Status;//转账单据状态
                alipayResponse.trans_date = response.TransDate;//订单支付时间
            }
            else
            {
                alipayResponse.code = response.Code;
                alipayResponse.msg = response.Msg;
                alipayResponse.sub_code = response.SubCode;
                alipayResponse.sub_msg = response.SubMsg;
            }
            return alipayResponse;
        }
    }

结束语：有什么问题可以给我留言。