PHP接入微信官方支付（native·APIv3）

一、项目介绍

两个文件实现微信官方支付（native·apiv3）的发起支付和回调应答功能

二、准备资料

1. 商户号：需要使用到营业执照注册商户
2. appid：小程序或者订阅号的appid
3. APIv3秘钥：32位秘钥，APIv2秘钥为16位，不要混淆
4. 证书序号：apiclient_key.pem文件中的秘钥，需要将该文件改为txt后缀，然后获取其中的秘钥

三、支付代码

1.index.PHP文件

setTotalFee($payAmount);$wxPay->setOutTradeNo($outTradeNo);$wxPay->setOrderName($orderName);$wxPay->setNotifyUrl($notifyUrl);$result = $wxPay->doPay();$url = 'https://wenhairu.com/static/api/qr/?size=300&text=' . $result['code_url'];echo "
";echo '二维码内容：' . $result['code_url'];//IndexService类class IndexService{    protected $mchid;    protected $appid;    protected $apiKey;    protected $privateKey;    protected $serialNumber;    protected $totalFee;    protected $outTradeNo;    protected $orderName;    protected $notifyUrl;    protected $auth;    protected $gateWay='https://api.mch.weixin.qq.com/v3';    public function __construct($mchid, $appid, $apikey, $privateKey, $serialNumber)    {        $this->mchid = $mchid;        $this->appid = $appid;        $this->apiKey = $apikey;        $this->privateKey = $privateKey;        $this->serialNumber = $serialNumber;    }    public function setTotalFee($totalFee)    {        $this->totalFee = floatval($totalFee);    }    public function setOutTradeNo($outTradeNo)    {        $this->outTradeNo = $outTradeNo;    }    public function setOrderName($orderName)    {        $this->orderName = $orderName;    }    public function setNotifyUrl($notifyUrl)    {        $this->notifyUrl = $notifyUrl;    }        public function doPay()    {        $reqParams = array(            'appid' => $this->appid,        //公众号或移动应用appid            'mchid' => $this->mchid,        //商户号            'description' => $this->orderName,     //商品描述            'attach' => 'pay',              //附加数据，在查询API和支付通知中原样返回，可作为自定义参数使用            'notify_url' => $this->notifyUrl,       //通知URL必须为直接可访问的URL，不允许携带查询串。            'out_trade_no' => $this->outTradeNo,      //商户系统内部订单号，只能是数字、大小写字母_-*且在同一个商户号下唯一，详见【商户订单号】。特殊规则：最小字符长度为6            'amount'=>array(                'total'=> floatval($this->totalFee) * 100, //订单总金额，单位为分                'currency'=> 'CNY', //CNY：人民币，境内商户号仅支持人民币            ),            'scene_info'=>array(        //支付场景描述                'payer_client_ip'=>'127.0.0.1'   //调用微信支付API的机器IP            )        );        $reqUrl = $this->gateWay.'/pay/transactions/native';        $this->getAuthStr($reqUrl,$reqParams);        $response = $this->curlPost($reqUrl,$reqParams);        return json_decode($response,true);    }    public function curlPost($url = '', $postData = array(), $options = array())    {        if (is_array($postData)) {            $postData = json_encode($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_HTTPHEADER, array(            'Authorization:'.$this->auth,            'Content-Type:application/json',            'Accept:application/json',            'User-Agent:'.$_SERVER['HTTP_USER_AGENT']        ));        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 $data;    }    private function getSchema(): string    {        return 'WECHATPAY2-SHA256-RSA2048';    }    public function getAuthStr($requestUrl,$reqParams=array()): string    {        $schema = $this->getSchema();        $token = $this->getToken($requestUrl,$reqParams);        $this->auth = $schema.' '.$token;        return $this->auth;    }    private function getNonce()    {        static $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';        $charactersLength = strlen($characters);        $randomString = '';        for ($i = 0; $i < 32; $i++) {            $randomString .= $characters[rand(0, $charactersLength - 1)];        }        return $randomString;    }    public function getToken($requestUrl,$reqParams=array()): string    {        $body = $reqParams ?  json_encode($reqParams) : '';        $nonce = $this->getNonce();        $timestamp = time();        $message = $this->buildMessage($nonce, $timestamp, $requestUrl,$body);        $sign = $this->sign($message);        $serialNo = $this->serialNumber;        return sprintf('mchid="%s",nonce_str="%s",timestamp="%d",serial_no="%s",signature="%s"',            $this->mchid, $nonce, $timestamp, $serialNo, $sign        );    }    private function buildMessage($nonce, $timestamp, $requestUrl, $body = ''): string    {        $method = 'POST';        $urlParts = parse_url($requestUrl);        $canonicalUrl = ($urlParts['path'] . (!empty($urlParts['query']) ? "?{$urlParts['query']}" : ""));        return strtoupper($method) . "\n" .            $canonicalUrl . "\n" .            $timestamp . "\n" .            $nonce . "\n" .            $body . "\n";    }    private function sign($message): string    {        if (!in_array('sha256WithRSAEncryption', openssl_get_md_methods(true))) {            throw new \RuntimeException("当前PHP环境不支持SHA256withRSA");        }        $res = $this->privateKey;        if (!openssl_sign($message, $sign, $res, 'sha256WithRSAEncryption')) {            throw new \UnexpectedValueException("签名验证过程发生了错误");        }        return base64_encode($sign);    }}

说明：

1. 该微信支付属于native的APIv3版本，需要用到商户证书的相关内内容，不要和微信的其他支付方式或者APIv2相混淆
2. index.php中的支付成功通知地址需要用Https协议，该文件内容，下面会给出
3. 仅需要填写IndexService类上边的配置即可，IndexService类的内容不需要修改

 2.notify.php

decryptToString($associatedData, $nonceStr, $ciphertext);//解密结果，为关联数组格式$resultArray = json_decode($resultJson, true);//交易成功if ($resultArray['trade_state'] === 'SUCCESS') {  //这里填写交易成功的相关业务，如更新账单状态，其中可能需要用到的参数如下    //$resultArray['out_trade_no']       商户订单号  //$resultArray['transaction_id']     订单号  //$resultArray['amount']['total']    订单金额}//NotifyService类class NotifyService{    protected $apiKey;    const AUTH_TAG_LENGTH_BYTE = 16;    public function __construct($apiKey)    {        $this->apiKey = $apiKey;    }        public function decryptToString(string $associatedData, string $nonceStr, string $ciphertext)    {        $ciphertext = \base64_decode($ciphertext);        if (strlen($ciphertext) <= self::AUTH_TAG_LENGTH_BYTE) {            return false;        }        $ctext = substr($ciphertext, 0, -self::AUTH_TAG_LENGTH_BYTE);        $authTag = substr($ciphertext, -self::AUTH_TAG_LENGTH_BYTE);        return \openssl_decrypt($ctext, 'aes-256-gcm', $this->apiKey, \OPENSSL_RAW_DATA, $nonceStr,            $authTag, $associatedData);    }} 

注意：

1. notify.php中需要再次填写你的APIv3秘钥
2. 在交易成功的if语句中，填写最终支付成功的相关业务逻辑

四、项目总结

1. 如果有相关问题，可以在下面评论区评论

来源地址：https://blog.csdn.net/qq_63573498/article/details/129997511