微信小程序支付流程操作及源码讲解

首先有自己的小程序以及商户平台；
进入小程序后台，绑定商户平台，获得appid和mch_id，两者需具备绑定关系，以此来使用微信支付提供的开放接口；

根据图操作，进入商户平台：

商户平台中添加小程序appid,绑定成功后，进入小程序后台确定；
微信官方文档 https://pay.weixin.qq.com/static/pay_setting/appid_protocol.shtml
代码操作：

在小程序的代码中调用wx.login()来向微信获取到code，拿到了之后把code通过request传给商户服务器，再由服务器来跟微信服务器要session_key和openID

小程序中，buy.js

<script>
    buyVip: function () {
        var a = this;
        dataApi.wxPay({
            uid: wx.getStorageSync("uid"),//用户id      
            id: 15,
            type: 2,//类型      
            auth_selected_str: a.data.auth_selected_str,//选择的支付套餐标识    
        }).then(function (t) {
            console.log(t);//获取设置的支付参数     
            var orderid = t.data.orderid;
            wx.requestPayment({
                timeStamp: String(t.data.timeStamp),//时间戳      
                nonceStr: t.data.nonceStr,//随机字符串       
                package: t.data.package,//统一下单接口返回的 prepay_id 参数值       
                signType: t.data.signType,//签名算法       
                paySign: t.data.paySign,//签名       
                success: function (t) {
                    wx.showToast({icon: "success", title: "支付成功"});
                    wx.switchTab({//支付成功,跳转           
                        url: "../payOk/payOk"
                    });
                }, fail: function (t) {
                    wx.showToast({icon: "none", title: "支付失败,请重试~"});
                }
            });
        }).catch(function (t) {
            console.log(t);
        })
    }
</script>

buyVip: function () {

var a = this;

dataApi.wxPay({

uid: wx.getStorageSync("uid"),//用户id

id: 15,

type: 2,//类型

auth_selected_str: a.data.auth_selected_str,//选择的支付套餐标识

}).then(function (t) {

console.log(t);//获取设置的支付参数

var orderid = t.data.orderid;

wx.requestPayment({

timeStamp: String(t.data.timeStamp),//时间戳

nonceStr: t.data.nonceStr,//随机字符串

package: t.data.package,//统一下单接口返回的 prepay_id 参数值

signType: t.data.signType,//签名算法

paySign: t.data.paySign,//签名

success: function (t) {

wx.showToast({icon: "success", title: "支付成功"});

wx.switchTab({//支付成功,跳转

url: "../payOk/payOk"

});

}, fail: function (t) {

wx.showToast({icon: "none", title: "支付失败,请重试~"});

}

});

}).catch(function (t) {

console.log(t);

})

}

</script>

服务器后端：

public function dopageWxPay()
{
    global $_W;
    global $_GPC;
    $uid               = intval($_GPC['uid']);
    $type              = intval($_GPC['type']);
    $id                = intval($_GPC['id']);
    $auth_selected_str = $_GPC['auth_selected_str'];
    //获取支付设置
    $setting  = pdo_get('g_setting', ['weid' => $_W['uniacid']], ['pay_open', 'auth']);
    $pay_open = $setting ? $setting['pay_open'] : '';
    if ($pay_open != 1) {
        return $this->result(1, '未开启支付', []);
    }    //支付套餐数组
    $auth  = $setting ? unserialize($setting['auth']) : '';
    $price = 0;//根据标识获取价格
    if ($auth) {
        foreach ($auth as $k => $v) {
            if ($k == $auth_selected_str) {
                $price = $v;
            }
        }
    }
    if ($price > 0) {
        $openid                 = pdo_getcolumn('g_user', ['weid' => $_W['uniacid'], 'id' => $uid], 'openid');
        $order_sn               = getNonceStr(8) . date('his') . getNonceStr(8);//随机订单号
        $insert                 = [];
        $insert['weid']         = $_W['uniacid'];
        $insert['type']         = $type;
        $insert['out_trade_no'] = $order_sn;
        $insert['userid']       = $uid;
        $insert['openid']       = $openid;
        $insert['order_status'] = 0;//支付状态
        $insert['all_money']    = $price;
        $insert['true_money']   = $price;
        $insert['createtime']   = TIMESTAMP;
        $insert['msg']          = '微信支付';
        $insert['dataid']       = $id;
        pdo_insert('g_order', $insert);//添加订单记录
        $orderid           = pdo_insertid();
        $sys               = pdo_fetch('SELECT mchid,pay_secret FROM ' . tablename('g_setting') . ' WHERE weid = :weid ', [':weid' => $_W['uniacid']]);
        $nonce_str         = getNonceStr(32);
        $fee               = $price * 100;
        $spbill_create_ip  = $_SERVER['REMOTE_ADDR'];
        $notify            = $_W['siteroot'] . 'addons/go/wxresult.php';
        $orderinfo         = ['appid' => $_W['account']['key'], 'mch_id' => $sys['mchid'], 'nonce_str' => $nonce_str, 'body' => '资料购买', 'out_trade_no' => $order_sn, 'total_fee' => $fee, 'spbill_create_ip' => $spbill_create_ip, 'notify_url' => $notify, 'trade_type' => 'JSAPI', 'openid' => $openid];
        $sign              = getSign($orderinfo, $sys['pay_secret']);
        $orderinfo['sign'] = $sign;
        $xml               = arrayToXml($orderinfo);
        $url               = 'https://api.mch.weixin.qq.com/pay/unifiedorder';
        $res               = api_notice_increment($url, $xml);
        libxml_disable_entity_loader(true);
        $xmlstring = simplexml_load_string($res, 'SimpleXMLElement', LIBXML_NOCDATA);
        $returnarr = json_decode(json_encode($xmlstring), true);
        $data      = [];
        if (($returnarr['return_code'] == 'SUCCESS') && ($returnarr['result_code'] == 'SUCCESS')) {
            $prepay_id                = $returnarr['prepay_id'];
            $update                   = [];
            $update['transaction_sn'] = $prepay_id;
            pdo_update('g_order', $update, ['id' => $orderid, 'weid' => $_W['uniacid']]);
            $data            = ['appId' => $_W['account']['key'], 'timeStamp' => TIMESTAMP, 'nonceStr' => $nonce_str, 'package' => 'prepay_id=' . $prepay_id, 'signType' => 'MD5'];
            $paySign         = getSign($data, $sys['pay_secret']);
            $data['paySign'] = $paySign;
            $data['orderid'] = $orderid;
            $data['price']   = $price;
            return $this->result(0, '获取支付参数', $data);
        } else {
            $data['msg'] = $returnarr['return_msg'];
            return $this->result(1, '支付失败，请重试', $data);
        }
    } else {
        return $this->result(1, '不需要购买', []);
    }
}

public function dopageWxPay()

{

global $_W;

global $_GPC;

$uid = intval($_GPC['uid']);

$type = intval($_GPC['type']);

$id = intval($_GPC['id']);

$auth_selected_str = $_GPC['auth_selected_str'];

//获取支付设置

$setting = pdo_get('g_setting', ['weid' => $_W['uniacid']], ['pay_open', 'auth']);

$pay_open = $setting ? $setting['pay_open'] : '';

if ($pay_open != 1) {

return $this->result(1, '未开启支付', []);

} //支付套餐数组

$auth = $setting ? unserialize($setting['auth']) : '';

$price = 0;//根据标识获取价格

if ($auth) {

foreach ($auth as $k => $v) {

if ($k == $auth_selected_str) {

$price = $v;

}

if ($price > 0) {

$openid = pdo_getcolumn('g_user', ['weid' => $_W['uniacid'], 'id' => $uid], 'openid');

$order_sn = getNonceStr(8) . date('his') . getNonceStr(8);//随机订单号

$insert = [];

$insert['weid'] = $_W['uniacid'];

$insert['type'] = $type;

$insert['out_trade_no'] = $order_sn;

$insert['userid'] = $uid;

$insert['openid'] = $openid;

$insert['order_status'] = 0;//支付状态

$insert['all_money'] = $price;

$insert['true_money'] = $price;

$insert['createtime'] = TIMESTAMP;

$insert['msg'] = '微信支付';

$insert['dataid'] = $id;

pdo_insert('g_order', $insert);//添加订单记录

$orderid = pdo_insertid();

$sys = pdo_fetch('SELECT mchid,pay_secret FROM ' . tablename('g_setting') . ' WHERE weid = :weid ', [':weid' => $_W['uniacid']]);

$nonce_str = getNonceStr(32);

$fee = $price * 100;

$spbill_create_ip = $_SERVER['REMOTE_ADDR'];

$notify = $_W['siteroot'] . 'addons/go/wxresult.php';

$orderinfo = ['appid' => $_W['account']['key'], 'mch_id' => $sys['mchid'], 'nonce_str' => $nonce_str, 'body' => '资料购买', 'out_trade_no' => $order_sn, 'total_fee' => $fee, 'spbill_create_ip' => $spbill_create_ip, 'notify_url' => $notify, 'trade_type' => 'JSAPI', 'openid' => $openid];

$sign = getSign($orderinfo, $sys['pay_secret']);

$orderinfo['sign'] = $sign;

$xml = arrayToXml($orderinfo);

$url = 'https://api.mch.weixin.qq.com/pay/unifiedorder';

$res = api_notice_increment($url, $xml);

libxml_disable_entity_loader(true);

$xmlstring = simplexml_load_string($res, 'SimpleXMLElement', LIBXML_NOCDATA);

$returnarr = json_decode(json_encode($xmlstring), true);

$data = [];

if (($returnarr['return_code'] == 'SUCCESS') && ($returnarr['result_code'] == 'SUCCESS')) {

$prepay_id = $returnarr['prepay_id'];

$update = [];

$update['transaction_sn'] = $prepay_id;

pdo_update('g_order', $update, ['id' => $orderid, 'weid' => $_W['uniacid']]);

$data = ['appId' => $_W['account']['key'], 'timeStamp' => TIMESTAMP, 'nonceStr' => $nonce_str, 'package' => 'prepay_id=' . $prepay_id, 'signType' => 'MD5'];

$paySign = getSign($data, $sys['pay_secret']);

$data['paySign'] = $paySign;

$data['orderid'] = $orderid;

$data['price'] = $price;

return $this->result(0, '获取支付参数', $data);

} else {

$data['msg'] = $returnarr['return_msg'];

return $this->result(1, '支付失败，请重试', $data);

}

} else {

return $this->result(1, '不需要购买', []);

}

阿慕笔记

微信小程序支付流程操作及源码讲解

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微信小程序支付流程操作及源码讲解

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