一、微信支付后台服务器部署
服务器采用ubuntu16.04 + php7.0 + apache2.0。
微信支付后台服务使用了curl 和 samplexml ，因此php.ini配置中必须开启这两项的扩展。
查看是否开启这两项扩展：在网站根目录下（www）下新建index.php文件，文件代码写入：phpinfo() 保存退出，然后访问index.php.如果在网页中找到，这说明已经开启，反之没有开启。
如果没有开启这两项扩展，微信小程序支付调试会提示：内部错误（500）
1、开启curl扩展的方法：
sudo apt-get install curl libcurl3 libcurl-dev php7.0-curl
命令成功安装curl后，重启apache服务
sudo /etc/init.d/apache2 restart
如果仍有问题，尝试编辑php.ini配置文件（文件路径：/etc/php/7.0/apache2/php.ini）
找到“extentsion = php_curl.dll”把前面的“#”号去掉，保存重启apache服务。
2、开启simplexml方法：
sudo apt-get install php7.0-xml
命令成功安装samplexml 重启apache服务
如果仍有问题，尝试编辑php.ini配置文件
找到“extentsion = php_samplexml.dll” 去掉前面的“#”，保存重启apache服务。
二、微信支付服务程序搭建
去官网下载sdk和demo文件。我们这里是下载php版本。
下载地址：https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=11_1
sdk与demo的文件结构如下：
下载文件后把文件拷贝到服务器上，服务的入口文件是 wxpay/jsapi.php
1 <?php 2 /** 3 *微信小程序支付后台交易程序 4 **/ 5 require_once "../lib/WxPay.Api.php"; 6 require_once "WxPay.Config.php"; 7 require_once \'log.php\'; 8 header(\'Access-Control-Allow-Origin:*\');//注意！跨域要加这个头 9 header("Access-Control-Allow-Method:POST,GET"); 10 /* 11 * 初始化日志 12 * 13 */ 14 $logHandler= new CLogFileHandler("../logs/".date(\'Y-m-d\').\'.log\'); 15 $log = Log::Init($logHandler); 16 17 if($_SERVER[\'REQUEST_METHOD\'] != \'POST\'){ 18 return_err(\'error request method\'); 19 } 20 log::info("*****交易开始*****"); 21 //$info = json_encode($_POST); 22 //log::info($info); 23 try{ 24 $openid = $_POST[\'openid\'];//openid 微信唯一识别码 25 $body = $_POST[\'body\'];//设置商品或支付单简要描述 26 $order_sn = $_POST[\'order_sn\'];//订单号 27 $total_fee = $_POST[\'total_fee\'];//付款金额 28 log::info(\'*****获取post值开始*****\'); 29 log::info($openid); 30 log::info($body); 31 log::info($order_sn); 32 log::info($total_fee); 33 log::info(\'*****获取post值结束*****\'); 34 /*统一下单*/ 35 $input = new WxPayUnifiedOrder(); 36 $input->SetBody($body);//设置商品或支付单简要描述 37 $input->SetAttach($body);//设置附加数据，在查询API和支付通知中原样返回，该字段主要用于商户携带订单的自定义数据 38 $input->SetOut_trade_no($order_sn);//设置商户系统内部的订单号,32个字符内、可包含字母, 其他说明见商户订单号 39 $input->SetTotal_fee($total_fee);//设置订单总金额，只能为整数，详见支付金额 40 $input->SetTime_start(date("YmdHis")); 41 $input->SetTime_expire(date("YmdHis", time() + 600)); 42 //$input->SetGoods_tag("test");//设置商品标记，代金券或立减优惠功能的参数，说明详见代金券或立减优惠 43 $input->SetNotify_url( \'https://\'.$_SERVER[\'HTTP_HOST\'].\'/notify.php\'); 44 $input->SetTrade_type("JSAPI"); 45 $input->SetOpenid($openid); 46 $config = new WxPayConfig(); 47 $order = WxPayApi::unifiedOrder($config, $input); 48 return_data($order); 49 50 } catch(Exception $e) { 51 log::info(\'*****异常错误开始*****\'); 52 } 53 /** 54 * 错误返回提示 55 * @param string $errMsg 错误信息 56 * @param string $status 错误码 57 * @return json的数据 58 */ 59 function return_err($errMsg=\'error\',$status=0){ 60 $ret_str = json_encode(array(\'status\'=>$status,\'result\'=>\'fail\',\'errmsg\'=>$errMsg)); 61 Log::ERROR("error request method"); 62 exit($ret_str); 63 } 64 /** 65 * 正确返回 66 * @param array $data 要返回的数组 67 * @return json的数据 68 */ 69 function return_data($data=array()){ 70 $ret_str = json_encode(array(\'status\'=>1,\'result\'=>\'success\',\'data\'=>$data)); 71 log::INFO($ret_str); 72 exit($ret_str); 73 }
在配置文件中配置相应的常量，必须注意一点的是商户号 mchid 与 appid 一定要匹配，，如果调试提示未匹配在，进入 微信支付后台（pay.weixin.qq.com） 中的产品中心下的APPID授权管理中加入，加入后需要，登入小程序的管理后台审核通过。
经过上面的注意事项后，程序支付调用成功，则返回
根据返回的内容，发起微信支付请求，下面是支付函数封装
/**
* 微信支付
* 参数说明：
* @body 商品或支付单简要描述
* @order_no 订单号
* @totalprice 支付金额 （微信支付是以分为单位的，要转换成元为单位。）
*function wxpay(body, order_sn,totalpri var that = this wx.request({
url: app.globalData.urlWxpayPath, method: "POST", header: { \'content-type\': \'application/x-www-form-urlencoded\' }, data: { "openid": app.globalData.openid, "body": body, "order_sn": order_sn, "total_fee": Number(totalprice)*100 //微信支付是以分为单位的，要转换成元为单位。 }, success: function (res) { //console.log(res); //console.log(new Date().bv ().toString()); var appid = res.data.data.appid; var mch_id = res.data.data.mch_id; var prepay_id = res.data.data.prepay_id; var sign = res.data.data.sign; var trade_type = res.data.data.trade_type; var timeStamp = new Date().getTime().toString();//时间戳 var nonceStr = res.data.data.nonce_str; var signType = \'MD5\'; const key = app.globalData.key;//key为商户的支付密钥，微信后台页面可以查询到。 var pg = \'prepay_id=\' + res.data.data.prepay_id;
//md5加密 var paySign = utils.hexMD5(\'appId=\' + appid + \'&nonceStr=\' + nonceStr + \'&package=\' + pg + \'&signType=\' + signType + \'&timeStamp=\' + timeStamp + \'&key=\' + key); //console.log(paySign.toUpperCase()); wx.requestPayment({ timeStamp: timeStamp, nonceStr: nonceStr, package: pg, signType: \'MD5\', paySign: paySign.toUpperCase(), success: function (res) { //接口调用成功的回调函数 //console.log(res) wx.showToast({ title: \'支付成功\', icon: \'none\', duration: 2000 }) }, fail: function (res) { //接口调用失败的回调函数 wx.showToast({ title: \'支付失败\', icon: \'none\', duration: 2000 }) }, complete: function (res) { //接口调用结束的回调函数（调用成功、失败都会执行） console.log(res); } }) } }) }
支付请求中paySign涉及到一个md5 加密算法
/* * A JavaScript implementation of the RSA Data Security, Inc. MD5 Message * Digest Algorithm, as defined in RFC 1321. * Version 1.1 Copyright (C) Paul Johnston 1999 - 2002. * Code also contributed by Greg Holt * See http://pajhome.org.uk/site/legal.html for details. */ /* * Add integers, wrapping at 2^32. This uses 16-bit operations internally * to work around bugs in some JS interpreters. */ function safe_add(x, y) { var lsw = (x & 0xFFFF) + (y & 0xFFFF) var msw = (x >> 16) + (y >> 16) + (lsw >> 16) return (msw << 16) | (lsw & 0xFFFF) } /* * Bitwise rotate a 32-bit number to the left. */ function rol(num, cnt) { return (num << cnt) | (num >>> (32 - cnt)) } /* * These functions implement the four basic operations the algorithm uses. */ function cmn(q, a, b, x, s, t) { return safe_add(rol(safe_add(safe_add(a, q), safe_add(x, t)), s), b) } function ff(a, b, c, d, x, s, t) { return cmn((b & c) | ((~b) & d), a, b, x, s, t) } function gg(a, b, c, d, x, s, t) { return cmn((b & d) | (c & (~d)), a, b, x, s, t) } function hh(a, b, c, d, x, s, t) { return cmn(b ^ c ^ d, a, b, x, s, t) } function ii(a, b, c, d, x, s, t) { return cmn(c ^ (b | (~d)), a, b, x, s, t) } /* * Calculate the MD5 of an array of little-endian words, producing an array * of little-endian words. */ function coreMD5(x) { var a = 1732584193 var b = -271733879 var c = -1732584194 var d = 271733878 for (var i = 0; i < x.length; i += 16) { var olda = a var oldb = b var oldc = c var oldd = d a = ff(a, b, c, d, x[i + 0], 7, -680876936) d = ff(d, a, b, c, x[i + 1], 12, -389564586) c = ff(c, d, a, b, x[i + 2], 17, 606105819) b = ff(b, c, d, a, x[i + 3], 22, -1044525330) a = ff(a, b, c, d, x[i + 4], 7, -176418897) d = ff(d, a, b, c, x[i + 5], 12, 1200080426) c = ff(c, d, a, b, x[i + 6], 17, -1473231341) b = ff(b, c, d, a, x[i + 7], 22, -45705983) a = ff(a, b, c, d, x[i + 8], 7, 1770035416) d = ff(d, a, b, c, x[i + 9], 12, -1958414417) c = ff(c, d, a, b, x[i + 10], 17, -42063) b = ff(b, c, d, a, x[i + 11], 22, -1990404162) a = ff(a, b, c, d, x[i + 12], 7, 1804603682) d = ff(d, a, b, c, x[i + 13], 12, -40341101) c = ff(c, d, a, b, x[i + 14], 17, -1502002290) b = ff(b, c, d, a, x[i + 15], 22, 1236535329) a = gg(a, b, c, d, x[i + 1], 5, -165796510) d = gg(d, a, b, c, x[i + 6], 9, -1069501632) c = gg(c, d, a, b, x[i + 11], 14, 643717713) b = gg(b, c, d, a, x[i + 0], 20, -373897302) a = gg(a, b, c, d, x[i + 5], 5, -701558691) d = gg(d, a, b, c, x[i + 10], 9, 38016083) c = gg(c, d, a, b, x[i + 15], 14, -660478335) b = gg(b, c, d, a, x[i + 4], 20, -405537848) a = gg(a, b, c, d, x[i + 9], 5, 568446438) d = gg(d, a, b, c, x[i + 14], 9, -1019803690) c = gg(c, d, a, b, x[i + 3], 14, -187363961) b = gg(b, c, d, a, x[i + 8], 20, 1163531501) a = gg(a, b, c, d, x[i + 13], 5, -1444681467) d = gg(d, a, b, c, x[i + 2], 9, -51403784) c = gg(c, d, a, b, x[i + 7], 14, 1735328473) b = gg(b, c, d, a, x[i + 12], 20, -1926607734) a = hh(a, b, c, d, x[i + 5], 4, -378558) d = hh(d, a, b, c, x[i + 8], 11, -2022574463) c = hh(c, d, a, b, x[i + 11], 16, 1839030562) b = hh(b, c, d, a, x[i + 14], 23, -35309556) a = hh(a, b, c, d, x[i + 1], 4, -1530992060) d = hh(d, a, b, c, x[i + 4], 11, 1272893353) c = hh(c, d, a, b, x[i + 7], 16, -155497632) b = hh(b, c, d, a, x[i + 10], 23, -1094730640) a = hh(a, b, c, d, x[i + 13], 4, 681279174) d = hh(d, a, b, c, x[i + 0], 11, -358537222) c = hh(c, d, a, b, x[i + 3], 16, -722521979) b = hh(b, c, d, a, x[i + 6], 23, 76029189) a = hh(a, b, c, d, x[i + 9], 4, -640364487) d = hh(d, a, b, c, x[i + 12], 11, -421815835) c = hh(c, d, a, b, x[i + 15], 16, 530742520) b = hh(b, c, d, a, x[i + 2], 23, -995338651) a = ii(a, b, c, d, x[i + 0], 6, -198630844) d = ii(d, a, b, c, x[i + 7], 10, 1126891415) c = ii(c, d, a, b, x[i + 14], 15, -1416354905) b = ii(b, c, d, a, x[i + 5], 21, -57434055) a = ii(a, b, c, d, x[i + 12], 6, 1700485571) d = ii(d, a, b, c, x[i + 3], 10, -1894986606) c = ii(c, d, a, b, x[i + 10], 15, -1051523) b = ii(b, c, d, a, x[i + 1], 21, -2054922799) a = ii(a, b, c, d, x[i + 8], 6, 1873313359) d = ii(d, a, b, c, x[i + 15], 10, -30611744) c = ii(c, d, a, b, x[i + 6], 15, -1560198380) b = ii(b, c, d, a, x[i + 13], 21, 1309151649) a = ii(a, b, c, d, x[i + 4], 6, -145523070) d = ii(d, a, b, c, x[i + 11], 10, -1120210379) c = ii(c, d, a, b, x[i + 2], 15, 718787259) b = ii(b, c, d, a, x[i + 9], 21, -343485551) a = safe_add(a, olda) b = safe_add(b, oldb) c = safe_add(c, oldc) d = safe_add(d, oldd) } return [a, b, c, d] } /* * Convert an array of little-endian words to a hex string. */ function binl2hex(binarray) { var hex_tab = "0123456789abcdef" var str = "" for (var i = 0; i < binarray.length * 4; i++) { str += hex_tab.charAt((binarray[i >> 2] >> ((i % 4) * 8 + 4)) & 0xF) + hex_tab.charAt((binarray[i >> 2] >> ((i % 4) * 8)) & 0xF) } return str } /* * Convert an array of little-endian words to a base64 encoded string. */ function binl2b64(binarray) { var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/" var str = "" for (var i = 0; i < binarray.length * 32; i += 6) { str += tab.charAt(((binarray[i >> 5] << (i % 32)) & 0x3F) | ((binarray[i >> 5 + 1] >> (32 - i % 32)) & 0x3F)) } return str } /* * Convert an 8-bit character string to a sequence of 16-word blocks, stored * as an array, and append appropriate padding for MD4/5 calculation. * If any of the characters are >255, the high byte is silently ignored. */ function str2binl(str) { var nblk = ((str.length + 8) >> 6) + 1 // number of 16-word blocks var blks = new Array(nblk * 16) for (var i = 0; i < nblk * 16; i++) blks[i] = 0 for (var i = 0; i < str.length; i++) blks[i >> 2] |= (str.charCodeAt(i) & 0xFF) << ((i % 4) * 8) blks[i >> 2] |= 0x80 << ((i % 4) * 8) blks[nblk * 16 - 2] = str.length * 8 return blks } /* * Convert a wide-character string to a sequence of 16-word blocks, stored as * an array, and append appropriate padding for MD4/5 calculation. */ function strw2binl(str) { var nblk = ((str.length + 4) >> 5) + 1 // number of 16-word blocks var blks = new Array(nblk * 16) for (var i = 0; i < nblk * 16; i++) blks[i] = 0 for (var i = 0; i < str.length; i++) blks[i >> 1] |= str.charCodeAt(i) << ((i % 2) * 16) blks[i >> 1] |= 0x80 << ((i % 2) * 16) blks[nblk * 16 - 2] = str.length * 16 return blks } /* * External interface */ function hexMD5(str) { return binl2hex(coreMD5(str2binl(str))) } function hexMD5w(str) { return binl2hex(coreMD5(strw2binl(str))) } function b64MD5(str) { return binl2b64(coreMD5(str2binl(str))) } function b64MD5w(str) { return binl2b64(coreMD5(strw2binl(str))) } /* Backward compatibility */ function calcMD5(str) { return binl2hex(coreMD5(str2binl(str))) } module.exports = { hexMD5: hexMD5 }
这样程序就会成功接入微信支付了。
需要注意的一点是：支付需要传入的订单号不能重复使用，比如，第一次支付取消了，然后去订单页面去重新支付，会提示 total_fee 是必须传入选项，这时需要重新再生成一个新的订单号才行。
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