使用 PHP SDK

1composer require wechatpay/wechatpay

1composerexec CertificateDownloader.php -- -k ${apiV3key} -m ${mchId} -f ${mchPrivateKeyFilePath} -s ${mchSerialNo} -o ${outputFilePath}

1<?php
2require_once('vendor/autoload.php');
3use WeChatPay\Builder;
4use WeChatPay\Crypto\Rsa;
5use WeChatPay\Util\PemUtil;
6// 设置参数
7// 商户号
8$merchantId = '190000****';
9// 从本地文件中加载「商户API私钥」，「商户API私钥」会用来生成请求的签名
10$merchantPrivateKeyFilePath = 'file:///path/to/merchant/apiclient_key.pem';
11$merchantPrivateKeyInstance = Rsa::from($merchantPrivateKeyFilePath, Rsa::KEY_TYPE_PRIVATE);
12// 「商户API证书」的「证书序列号」
13$merchantCertificateSerial = '3775B6A45ACD588826D15E583A95F5DD********';
14// 从本地文件中加载「微信支付平台证书」(可使用证书下载工具得到），用来验证微信支付应答的签名
15$platformCertificateFilePath = 'file:///path/to/wechatpay/cert.pem';
16$platformPublicKeyInstance = Rsa::from($platformCertificateFilePath, Rsa::KEY_TYPE_PUBLIC);
17// 从「微信支付平台证书」中获取「证书序列号」
18$platformCertificateSerial = PemUtil::parseCertificateSerialNo($platformCertificateFilePath);
19// 构造一个 APIv3 客户端实例
20$instance = Builder::factory([
21    'mchid'      => $merchantId,
22    'serial'     => $merchantCertificateSerial,
23    'privateKey' => $merchantPrivateKeyInstance,
24    'certs'      => [
25        $platformCertificateSerial => $platformPublicKeyInstance,
26    ],
27]);
28// 以 Native 支付为例，发送请求
29$resp = $instance
30    ->chain('v3/pay/transactions/native')
31    ->post(['json' => [
32        'mchid'        => '1900006XXX',
33        'out_trade_no' => 'native12177525012014070332333',
34        'appid'        => 'wxdace645e0bc2cXXX',
35        'description'  => 'Image形象店-深圳腾大-QQ公仔',
36        'notify_url'   => 'https://weixin.qq.com/',
37        'amount'       => [
38            'total'    => 1,
39            'currency' => 'CNY'
40        ],
41    ]]);
42echo $resp->getBody(), PHP_EOL;