這幾天在弄nodejs和微信支付的對(duì)接减俏，弄了好幾天終于接通了，最大的問題就是簽名參數(shù)的大小寫問題碱工，支持公眾號(hào)支付和掃碼支付兩種方式
掃碼支付
1.先通過POST請(qǐng)求微信支付的統(tǒng)一下單接口
https://api.mch.weixin.qq.com/pay/unifiedorder
exports.pay = function (req, res)
{
var url = "https://api.mch.weixin.qq.com/pay/unifiedorder";
var appid = _appid;
var mch_id = _mch_id;
var notify_url = _notify_url;
var out_trade_no = _out_trade_no;
var total_fee = _total_fee;
var attach = _attach;
var body = _body;
var nonce_str = _nonce_str;
var formData = "<xml>";
formData += "<appid>"+appid+"</appid>"; //appid
formData += "<attach>"+attach+"</attach>"; //附加數(shù)據(jù)
formData += "<body>"+body+"</body>"; //商品或支付單簡(jiǎn)要描述
formData += "<mch_id>"+mch_id+"</mch_id>"; //商戶號(hào)
formData += "<nonce_str>"+nonce_str+"</nonce_str>"; //隨機(jī)字符串娃承，不長于32位
formData += "<notify_url>"+notify_url+"</notify_url>"; //支付成功后微信服務(wù)器通過POST請(qǐng)求通知這個(gè)地址
formData += "<openid></openid>"; //掃碼支付這個(gè)參數(shù)不是必須的
formData += "<out_trade_no>"+out_trade_no+"</out_trade_no>"; //訂單號(hào)
formData += "<spbill_create_ip></spbill_create_ip>"; //不是必須的
formData += "<total_fee>"+total_fee+"</total_fee>"; //金額
formData += "<trade_type>NATIVE</trade_type>"; //NATIVE會(huì)返回code_url 奏夫，JSAPI不會(huì)返回
formData += "<sign>" + paysign(appid,attach,body,out_trade_no,nonce_str,notify_url, '', out_trade_no,'', total_fee, 'NATIVE') + "</sign>";
formData += "</xml>";
request(
{
url : url,
method : 'POST',
body : formData
}, function (err, response, body)
{
if (!err && response.statusCode == 200)
{
console.log(body);
var prepay_id = getXMLNodeValue('prepay_id', body.toString("utf-8"));
var tmp = prepay_id.split('[');
var tmp1 = tmp[2].split(']');
var code_url = getXMLNodeValue('code_url', body.toString("utf-8"));
var tmp = code_url.split('[');
var tmp3 = tmp[2].split(']');
res.render('pay',
{
prepay_id : tmp1[0],
code_url : tmp3[0]
}
);
}
}
);
}
簽名加密算法
function paysign(appid,attach,body,mch_id,nonce_str,notify_url,openid,out_trade_no,spbill_create_ip,total_fee,trade_type) {
var ret = {
appid: appid,
attach: attach,
body: body,
mch_id: mch_id,
nonce_str: nonce_str,
notify_url:notify_url,
openid:openid,
out_trade_no:out_trade_no,
spbill_create_ip:spbill_create_ip,
total_fee:total_fee,
trade_type:trade_type
};
var string = raw(ret);
var key = _key;
string = string + '&key='+key; //key為在微信商戶平臺(tái)(pay.weixin.qq.com)-->賬戶設(shè)置-->API安全-->密鑰設(shè)置
var crypto = require('crypto');
return crypto.createHash('md5').update(string,'utf8').digest('hex');
};
function raw(args) {
var keys = Object.keys(args);
keys = keys.sort()
var newArgs = {};
keys.forEach(function (key) {
newArgs[key.toLowerCase()] = args[key];
});
var string = '';
for (var k in newArgs) {
string += '&' + k + '=' + newArgs[k];
}
string = string.substr(1);
return string;
};
2.通過返回回來的XML解析出code_url，就可以通過js生成二維碼圖片在PC端历筝，用戶使用微信掃一掃即可完成付款,完成付款后酗昼，微信服務(wù)器會(huì)發(fā)送一個(gè)POST請(qǐng)求到notify_url的地址，然后通過返回的xml來判斷是否付款成功
