微信支付native扫码支付apiv3开发流程获取二维码地址

1.准备几个东西

appid: wx*******************
v3密钥：GM****************************
商户号：16******************
证书序列号：12***（验证商户身份的证书）
平台证书详见2

配置并获取商户appId、证书、v3密钥、证书序列号等官方有接入指引，按照要求申请即可顺利获取：https://pay.weixin.qq.com/index.php/core/cert/api_cert#/api-cert-manage

准备平台证书

composer安装wechatpay官方推荐sdk官方仓库：
https://github.com/wechatpay-apiv3/wechatpay-php/tree/main

1.并运行安装命令：cd path_to_project/项目根目录
composer require wechatpay/wechatpay

# 查看使用帮助
php vendor/bin/CertificateDownloader.php -V`

我用的thinkphp8，平台证书制作在根目录下；

php vendor/bin/CertificateDownloader.php -m 1678****** -f "cert/apiclient_key.pem" -k 9fcacaca***************** -s 454E14B4*********************97609 -o "cert"

3.状态运行

4.如果提示报错：如下操作，再执行上述命令；

Trying [240e:e1:aa00:4000::94]:443...
Connected to api.mch.weixin.qq.com (240e:e1:aa00:4000::94) port 443
ALPN: curl offers http/1.1
SSL certificate problem: unable to get local issuer certificate
Closing connection
cURL error 60: SSL certificate problem: unable to get local issuer certificate (seehttps://curl.haxx.se/libcurl/c/libcurl-errors.html) forhttps://api.mch.weixin.qq.com/v3/certificates
需要进入到vendor/guzzlehttp/guzzle/src/Client.php，修改配置:

private function configureDefaults(array $config): void {
        $defaults = [
            'allow_redirects' => RedirectMiddleware::$defaultSettings,
            'http_errors' => true,
            'decode_content' => true,
           // verify = ture 修改成 false，等证书下载完成再改回来
            'verify' => false, 
            'cookies' => false,
            'idn_conversion' => false,
        ];
...
}

5.准备到位上代码

wxpay.php

<?php
// +----------------------------------------------------------------------
// | Author:laojiadehuiyi
// +----------------------------------------------------------------------
// | SystemName:项目管理系统
// +----------------------------------------------------------------------
// | Email:740453714@qq.com
// +----------------------------------------------------------------------
namespace app\common\service\wxpay;

use think\facade\Config;
use WeChatPay\Builder;
use WeChatPay\Crypto\Rsa;
use WeChatPay\Util\PemUtil;

class WxPay
{
    private $appid; // 应用ID
    private $weChatPay; // 微信支付对象
    private $merchantId; // 商户号
    private $merchantCertificateSerial; // 验证商户身份证的值证书序号
    private $merchantPrivateKeyFilePath; // 商户私钥文件路径
    private $platformCertPath; // 平台证书路径
    private $apiV3Key; // API v3 密钥
    public function __construct()
    {
        $settings = Config::get('wxconfig.wxpay'); // 获取微信支付配置
        $this->appid = $settings['appid'];
        $this->merchantId = $settings['mch_id'];
        $this->merchantCertificateSerial = $settings['serial_no'];
        $this->merchantPrivateKeyFilePath = $settings['private_key_path'];
        $this->platformCertPath = $settings['cert_path'];
        $this->apiV3Key = $settings['api_v3_key'];
    }
    public function Pay($order) {
        // 商户号
        $merchantId = $this->merchantId;

        // 从本地文件中加载「商户API私钥」，「商户API私钥」会用来生成请求的签名  // 商户私钥，用来发送数据签名
        $merchantPrivateKeyFilePath = $this->merchantPrivateKeyFilePath;
        $merchantPrivateKeyInstance = Rsa::from($merchantPrivateKeyFilePath, Rsa::KEY_TYPE_PRIVATE);

        // 「商户API证书」的「证书序列号」
        $merchantCertificateSerial = $this->merchantCertificateSerial;

        // 从本地文件中加载「微信支付平台证书」，用来验证微信支付应答的签名  // 微信公钥，用来验证返回数据的签名
        $platformCertificateFilePath = $this->platformCertPath;
        $platformPublicKeyInstance = Rsa::from($platformCertificateFilePath, Rsa::KEY_TYPE_PUBLIC);

        // 从「微信支付平台证书」中获取「证书序列号」
        $platformCertificateSerial = PemUtil::parseCertificateSerialNo($platformCertificateFilePath);

        // 构造一个 APIv3 客户端实例
        $instance = Builder::factory([
            'mchid' => $merchantId,
            'serial' => $merchantCertificateSerial,
            'privateKey' => $merchantPrivateKeyInstance,
            'certs' => [
                $platformCertificateSerial => $platformPublicKeyInstance,
            ],
        ]);

        try {
            $resp = $instance
                ->chain('v3/pay/transactions/native') // 这里使用的native支付，其它接口参考官方文档，如jsapi
                ->post(['json' => [
                    'mchid' => $this->merchantId,
                    'out_trade_no' => $order['out_trade_no'],
                    'appid' => $order['appid'],
                    'description' => $order['description'],
                    'notify_url' => 'https://weixin.qq.com/',
                    'amount' => [
                        'total' => $order['amount_total'],
                        'currency' => 'CNY',
                    ],
                ]]);

            echo $resp->getStatusCode(), PHP_EOL;
            echo $resp->getBody(), PHP_EOL;
        } catch (\Exception $e) {
            // 进行错误处理
            echo $e->getMessage(), PHP_EOL;
            if ($e instanceof \GuzzleHttp\Exception\RequestException  && $e->hasResponse()) {
                $r = $e->getResponse();
                echo $r->getStatusCode() . ' ' . $r->getReasonPhrase(), PHP_EOL;
                echo $r->getBody(), PHP_EOL, PHP_EOL, PHP_EOL;
            }
            echo $e->getTraceAsString(), PHP_EOL;
        }
    }


}

config.php

'wxpay' => [

            'appid' => 'wx71611a17676b9669',    //公众号appid
            'mch_id' => '1678525470',    //商户号
            'api_v3_key' => '9fcacaca8c5c511b6c544540b07860b5',    //v3密钥key
//        'api_v3_key' => '9fcacaca8c5c511b6c544540b07860b4',还有1个什么东西是这个串，现在不知道了
//            'serial_no' => '11D051C074ED98E2587919B2907ACC441685B927',//验证商户身份证的值证书序号
            'serial_no' => '454E14B4190FAD6934665C8A1D2B508057E97609',//api证书序列号（验证商户身份）
            'cert_path' => 'file://D:/phpstudy_pro/WWW/yylAdmin/runtime/cert/wechatpaypingtaicert.pem',    //apiclient_cert.pem证书路径'
            'private_key_path' => 'file://D:/phpstudy_pro/WWW/yylAdmin/runtime/cert/apiclient_key.pem'
            ]

6.结果展示

本文主要要点转载自
简书：Thinkphp8 集成微信支付sdk
@感谢作者：非新生代菜鸟
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