安装： composer require wechatpay/wechatpay Using version ^1.4 for wechatpay/wechatpay ./composer.json has been updated Running composer update wechatpay/wechatpay Loading composer repositories with package information Updating dependencies Lock file operations: 11 installs, 0 updates, 0 removals   - Locking guzzlehttp/guzzle (7.4.1)   - Locking guzzlehttp/promises (1.5.1)   - Locking guzzlehttp/psr7 (2.1.0)   - Locking guzzlehttp/uri-template (v1.0.1)   - Locking psr/http-client (1.0.1)   - Locking psr/http-factory (1.0.1)   - Locking psr/http-message (1.0.1)   - Locking ralouphie/getallheaders (3.0.3)   - Locking symfony/deprecation-contracts (v2.5.0)   - Locking symfony/polyfill-php80 (v1.25.0)   - Locking wechatpay/wechatpay (1.4.3) Writing lock file Installing dependencies from lock file (including require-dev) Package operations: 11 installs, 0 updates, 0 removals   - Installing guzzlehttp/promises (1.5.1): Extracting archive   - Installing ralouphie/getallheaders (3.0.3): Extracting archive   - Installing psr/http-message (1.0.1): Extracting archive   - Installing psr/http-factory (1.0.1): Extracting archive   - Installing guzzlehttp/psr7 (2.1.0): Extracting archive   - Installing psr/http-client (1.0.1): Extracting archive   - Installing symfony/deprecation-contracts (v2.5.0): Extracting archive   - Installing symfony/polyfill-php80 (v1.25.0): Extracting archive   - Installing guzzlehttp/uri-template (v1.0.1): Extracting archive   - Installing guzzlehttp/guzzle (7.4.1): Extracting archive   - Installing wechatpay/wechatpay (1.4.3): Extracting archive PHP版本：7.4.28 PHP代码： require '..../classes/vendor/autoload.php'; use WeChatPay\Builder; use WeChatPay\Crypto\Rsa; use WeChatPay\Util\PemUtil; use WeChatPay\Util\MediaUtil; ..... // 构造一个 APIv3 客户端实例 $instance = Builder::factory([     'mchid'      => $merchantId,     'serial'     => $merchantCertificateSerial,     'privateKey' => $merchantPrivateKeyInstance,     'certs'      => [         $platformCertificateSerial => $platformPublicKeyInstance,     ], ]); // 发送请求 $resp = $instance->chain('v3/certificates')->get(); 运行结果： Fatal error:  Uncaught GuzzleHttp\Exception\ClientException: Client error: `GET https://api.mch.weixin.qq.com/v3/certificates` resulted in a `401 Unauthorized` response: {"code":"SIGN_ERROR","detail":{"detail":{"issue":"sign not match"},"field":"signature","location":"authorization","sign_ (truncated...)  in .../classes/vendor/guzzlehttp/guzzle/src/Exception/RequestException.php:113 Stack trace: #0 .../classes/vendor/guzzlehttp/guzzle/src/Middleware.php(69): GuzzleHttp\Exception\RequestException::create(Object(GuzzleHttp\Psr7\Request), Object(GuzzleHttp\Psr7\Response), NULL, Array, NULL) #1 .../classes/vendor/guzzlehttp/promises/src/Promise.php(204): GuzzleHttp\Middleware::GuzzleHttp\{closure}(Object(GuzzleHttp\Psr7\Response)) #2 .../classes/vendor/guzzlehttp/promises/src/Promise.php(153): GuzzleHttp\Promise\Promise::callHandler(1, Object(GuzzleHttp\Psr7\Response), NULL) #3 .../classes/vendor/guzzlehttp/p in .../classes/vendor/guzzlehttp/guzzle/src/Exception/RequestException.php on line 113

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