1.微信公众平台开通微信支付，审核通过。
2.微信商户平台配置支付授权目录

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3.微信交易单号获取类

<?php

/*
 * 生活服务_微信付款
 */

namespace Apis\Controller;

use Common\Controller\AppframeController;

class WxpayController extends AppframeController {

    protected $mchid;
    protected $appid;
    protected $key;

    public function _initialize() {
        parent::_initialize();

        $this->mchid = '1430532102'; // 微信支付商户号 PartnerID 通过微信支付商户资料审核后邮件发送
        $this->appid = 'wx20d62ad060e66486'; //公众号APPID 通过微信支付商户资料审核后邮件发送
        $this->key = '8934e7d15453e97507ef7mao521125ab';   //https://pay.weixin.qq.com 帐户设置-安全设置-API安全-API密钥-设置API密钥
    }

    public function createJsBizPackage($openid, $totalFee, $outTradeNo, $orderName, $notifyUrl, $timestamp) {
        
        $config = array(
            'mch_id' => $this->mchid,
            'appid' => $this->appid,
            'key' => $this->key,
        );
        
        $unified = array(
            'appid' => $config['appid'],
            'attach' => '支付', //商家数据包，原样返回
            'body' => $orderName,
            'mch_id' => $config['mch_id'],
            'nonce_str' => $this->createNonceStr(),
            'notify_url' => $notifyUrl,
            'openid' => $openid, //rade_type=JSAPI，此参数必传
            'out_trade_no' => $outTradeNo,
            'spbill_create_ip' => '127.0.0.1',
            'total_fee' => intval($totalFee * 100), //单位 转为分
            'trade_type' => 'JSAPI',
        );
        
        $unified['sign'] = $this->getSign($unified, $config['key']);
        $responseXml = $this->curlPost('https://api.mch.weixin.qq.com/pay/unifiedorder', $this->arrayToXml($unified));
        
        $unifiedOrder = simplexml_load_string($responseXml, 'SimpleXMLElement', LIBXML_NOCDATA);
        if ($unifiedOrder === false) {
            die('parse xml error');
        }
        if ($unifiedOrder->return_code != 'SUCCESS') {
            die($unifiedOrder->return_msg);
        }
        if ($unifiedOrder->result_code != 'SUCCESS') {
            die($unifiedOrder->err_code);
            /*
              NOAUTH 商户无此接口权限
              NOTENOUGH 余额不足
              ORDERPAID 商户订单已支付
              ORDERCLOSED 订单已关闭
              SYSTEMERROR 系统错误
              APPID_NOT_EXIST   APPID不存在
              MCHID_NOT_EXIST MCHID不存在
              APPID_MCHID_NOT_MATCH appid和mch_id不匹配
              LACK_PARAMS 缺少参数
              OUT_TRADE_NO_USED 商户订单号重复
              SIGNERROR 签名错误
              XML_FORMAT_ERROR XML格式错误
              REQUIRE_POST_METHOD 请使用post方法
              POST_DATA_EMPTY post数据为空
              NOT_UTF8 编码格式错误
             */
        }
        //$unifiedOrder->trade_type 交易类型 调用接口提交的交易类型，取值如下：JSAPI，NATIVE，APP
        //$unifiedOrder->prepay_id 预支付交易会话标识 微信生成的预支付回话标识，用于后续接口调用中使用，该值有效期为2小时
        //$unifiedOrder->code_url 二维码链接 trade_type为NATIVE是有返回，可将该参数值生成二维码展示出来进行扫码支付
        $arr = array(
            "appId" => $config['appid'],
            "timeStamp" => $timestamp,
            "nonceStr" => $this->createNonceStr(),
            "package" => "prepay_id=" . $unifiedOrder->prepay_id,
            "signType" => 'MD5',
        );
        $arr['paySign'] = $this->getSign($arr, $config['key']);
        return $arr;
    }

    public function notify() {
        $config = array(
            'mch_id' => $this->mchid,
            'appid' => $this->appid,
            'key' => $this->key,
        );
        $postStr = $GLOBALS["HTTP_RAW_POST_DATA"];
        
        $postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
        if ($postObj === false) {
            die('parse xml error');
        }
        if ($postObj->return_code != 'SUCCESS') {
            die($postObj->return_msg);
        }
        if ($postObj->result_code != 'SUCCESS') {
            die($postObj->err_code);
        }
        $arr = (array) $postObj;
        unset($arr['sign']);
        if ($this->getSign($arr, $config['key']) == $postObj->sign) {
            // $mch_id = $postObj->mch_id; //微信支付分配的商户号
            // $appid = $postObj->appid; //微信分配的公众账号ID
            // $openid = $postObj->openid; //用户在商户appid下的唯一标识
            // $transaction_id = $postObj->transaction_id;//微信支付订单号
            // $out_trade_no = $postObj->out_trade_no;//商户订单号
            // $total_fee = $postObj->total_fee; //订单总金额，单位为分
            // $is_subscribe = $postObj->is_subscribe; //用户是否关注公众账号，Y-关注，N-未关注，仅在公众账号类型支付有效
            // $attach = $postObj->attach;//商家数据包，原样返回
            // $time_end = $postObj->time_end;//支付完成时间
            echo '<xml><return_code><![CDATA[SUCCESS]]></return_code><return_msg><![CDATA[OK]]></return_msg></xml>';
            return $postObj;
        }
    }

    /**
     * curl get
     *
     * @param string $url
     * @param array $options
     * @return mixed
     */
    public static function curlGet($url = '', $options = array()) {
        $ch = curl_init($url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_TIMEOUT, 30);
        if (!empty($options)) {
            curl_setopt_array($ch, $options);
        }
        //https请求 不验证证书和host
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
        $data = curl_exec($ch);
        curl_close($ch);
        return $data;
    }

    public static function curlPost($url = '', $postData = '', $options = array()) {
        if (is_array($postData)) {
            $postData = http_build_query($postData);
        }
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $postData);
        curl_setopt($ch, CURLOPT_TIMEOUT, 30); //设置cURL允许执行的最长秒数
        if (!empty($options)) {
            curl_setopt_array($ch, $options);
        }
        //https请求 不验证证书和host
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
        $data = curl_exec($ch);
        curl_close($ch);
        return $data;
    }

    public static function createNonceStr($length = 16) {
        $chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
        $str = '';
        for ($i = 0; $i < $length; $i++) {
            $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
        }
        return $str;
    }

    public static function arrayToXml($arr) {
        $xml = "<xml>";
        foreach ($arr as $key => $val) {
            if (is_numeric($val)) {
                $xml .= "<" . $key . ">" . $val . "</" . $key . ">";
            } else
                $xml .= "<" . $key . "><![CDATA[" . $val . "]]></" . $key . ">";
        }
        $xml .= "</xml>";
        return $xml;
    }

    /**
     * 例如：
     * appid：  wxd930ea5d5a258f4f
     * mch_id：  10000100
     * device_info： 1000
     * Body：  test
     * nonce_str： ibuaiVcKdpRxkhJA
     * 第一步：对参数按照 key=value 的格式，并按照参数名 ASCII 字典序排序如下：
     * stringA="appid=wxd930ea5d5a258f4f&body=test&device_info=1000&mch_i
     * d=10000100&nonce_str=ibuaiVcKdpRxkhJA";
     * 第二步：拼接支付密钥：
     * stringSignTemp="stringA&key=192006250b4c09247ec02edce69f6a2d"
     * sign=MD5(stringSignTemp).toUpperCase()="9A0A8659F005D6984697E2CA0A9CF3B7"
     */
    public static function getSign($params, $key) {
        ksort($params, SORT_STRING);
        $unSignParaString = self::formatQueryParaMap($params, false);
        $signStr = strtoupper(md5($unSignParaString . "&key=" . $key));
        return $signStr;
    }

    protected static function formatQueryParaMap($paraMap, $urlEncode = false) {
        $buff = "";
        ksort($paraMap);
        foreach ($paraMap as $k => $v) {
            if (null != $v && "null" != $v) {
                if ($urlEncode) {
                    $v = urlencode($v);
                }
                $buff .= $k . "=" . $v . "&";
            }
        }
        $reqPar = '';
        if (strlen($buff) > 0) {
            $reqPar = substr($buff, 0, strlen($buff) - 1);
        }
        return $reqPar;
    }

}

//方法调用
$res = $wx->createJsBizPackage($openid, $totalFee, $outTradeNo, $orderName, $notifyUrl, $timestamp);

3.回调函数

<?php
header('Content-Type: text/html; charset=utf-8');
$mysql_server_name='localhost'; //改成自己的mysql数据库服务器
$mysql_username='root'; //改成自己的mysql数据库用户名
$mysql_password='Pa1mtrends'; //改成自己的mysql数据库密码
$mysql_database='cloud'; //
$conn=mysql_connect($mysql_server_name,$mysql_username,$mysql_password) or die("error connecting") ; //连接数据库
mysql_query("set names 'utf8'"); //数据库输出编码 应该与你的数据库编码保持一致.南昌网站建设公司百恒网络PHP工程师建议用UTF-8 国际标准编码.
mysql_select_db($mysql_database); //打开数据库

$mchid = '143053xxxx'; // 微信支付商户号 PartnerID 通过微信支付商户资料审核后邮件发送
$appid = 'wx20d62ad06xxxxx'; //公众号APPID 通过微信支付商户资料审核后邮件发送
$key = '8934e7d15453e97507ef7mao5xxxxxx';   //https://pay.weixin.qq.com 帐户设置-安全设置-API安全-API密钥-设置API密钥

$config = array(
    'mch_id' => $mchid,
    'appid' => $appid,
    'key' => $key,
);

$postStr = file_get_contents("php://input");
if (!$postStr) {
    $postStr = "maozi";
}

$postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);

if ($postObj === false) {
    die('parse xml error');
}
if ($postObj->return_code != 'SUCCESS') {
    die($postObj->return_msg);
}
if ($postObj->result_code != 'SUCCESS') {
    die($postObj->err_code);
}
$arr = (array) $postObj;
unset($arr['sign']);

if (getSign($arr, $config['key']) == $postObj->sign) {
    
    $mch_id = $postObj->mch_id; //微信支付分配的商户号
    $appid = $postObj->appid; //微信分配的公众账号ID
    $openid = $postObj->openid; //用户在商户appid下的唯一标识
    $transaction_id = $postObj->transaction_id;//微信支付订单号
    $out_trade_no = $postObj->out_trade_no;//商户订单号
    $total_fee = $postObj->total_fee; //订单总金额，单位为分
    $total_fee = floatval($total_fee/100);
    
    $time_end = $postObj->time_end;//支付完成时间
    $time_end = strtotime(substr($time_end,0,4)."-".substr($time_end, 4,2)."-".substr($time_end,6,2)." ".substr($time_end,8,2).":".  substr($time_end, 10, 2).":".substr($time_end, 12, 2));
    
    //用户id
    $res = mysql_query("select * from cmf_market_order where sn='{$out_trade_no}'",$conn);
    $oinfo = mysql_fetch_assoc($res);
    $uid = $oinfo['uid'];
    
    //查询订单是否存在
    $has_sql = "select * from cmf_market_order_wx where wx_sn='{$transaction_id}'";
    $has = mysql_query($has_sql,$conn);
    $has = mysql_fetch_assoc($has);
    if ($has) {
        echo '<xml><return_code><![CDATA[SUCCESS]]></return_code><return_msg><![CDATA[OK]]></return_msg></xml>';
        exit;
    }
    
    //插入微信订单信息
    $sql = "insert into cmf_market_order_wx (mch_id,appid,openid,uid,sn,wx_sn,total,time) values ('{$mch_id}','{$appid}','{$openid}','{$uid}','{$out_trade_no}','{$transaction_id}','{$total_fee}','{$time_end}')";
    $result = mysql_query($sql,$conn);
    if ($result) {//更新订单状态
        $up_sql = "update cmf_market_order set haspay=1,status=1,paytime='{$time_end}' where sn='{$out_trade_no}'";
        $result_update = mysql_query($up_sql,$conn);
    }
    
    echo '<xml><return_code><![CDATA[SUCCESS]]></return_code><return_msg><![CDATA[OK]]></return_msg></xml>';
    return $postObj;
}

function getSign($params, $key) {
    ksort($params, SORT_STRING);
    $unSignParaString = formatQueryParaMap($params, false);
    $signStr = strtoupper(md5($unSignParaString . "&key=" . $key));
    return $signStr;
}

function formatQueryParaMap($paraMap, $urlEncode = false) {
    $buff = "";
    ksort($paraMap);
    foreach ($paraMap as $k => $v) {
        if (null != $v && "null" != $v) {
            if ($urlEncode) {
                $v = urlencode($v);
            }
            $buff .= $k . "=" . $v . "&";
        }
    }
    $reqPar = '';
    if (strlen($buff) > 0) {
        $reqPar = substr($buff, 0, strlen($buff) - 1);
    }
    return $reqPar;
}

?>

4.支付页面，直接调用支付接口

<html>
<head>
    <meta http-equiv="content-type" content="text/html;charset=utf-8"/>
    <title>微信安全支付</title>
    
    
    <script type="text/javascript">
        //调用微信JS api 支付
        function jsApiCall()
        {
            WeixinJSBridge.invoke(
                'getBrandWCPayRequest',
                {
                    "appId": "{$info['appId']}",
                    "timeStamp": "{$info['timeStamp']}",
                    "nonceStr": "{$info['nonceStr']}",
                    "package": "{$info['package']}",
                    "signType": "MD5",
                    "paySign": "{$info['paySign']}"
                },
                function(res){
                    if (res.err_msg == 'get_brand_wcpay_request:ok') {
                        alert("支付成功");
                        window.location.href = 'http://www.baidu.com';
                    } else {
                        alert("错误");
                    }
                }
            );
        }
        function callpay()
        {
            if (typeof WeixinJSBridge == "undefined"){
                if( document.addEventListener ){
                    document.addEventListener('WeixinJSBridgeReady', jsApiCall, false);
                }else if (document.attachEvent){
                    document.attachEvent('WeixinJSBridgeReady', jsApiCall); 
                    document.attachEvent('onWeixinJSBridgeReady', jsApiCall);
                }
            }else{
                jsApiCall();
            }
        }
    </script>
</head>
<body>
    </br></br></br></br>
    <div align="center">
        <button style="width:210px; height:30px; background-color:#FE6714; border:0px #FE6714 solid; cursor: pointer;  color:white;  font-size:16px;" type="button" onclick="callpay()" >贡献一下11111111</button>
    </div>
</body>
</html>