/** 商户号 */
public static String merchantId = "1101245633";

/** 商户API私钥路径 */
public static String privateKeyPath = "apiclient_key.pem";

/** 商户证书序列号 */
public static String merchantSerialNumber = "4AB2683D6D167EA4D1886131C437BFB485BFCC0E";

/** 商户APIV3密钥 */
public static String apiV3Key = "ZPXXwxzf1101245633Gongxiangsheng";
/** 初始化微信支付服务 */
public  JsapiService initWxPayService() {
    String privateKeyPath1 = getClasspathFileAbsolutePath(privateKeyPath);
    Config config =
            new RSAAutoCertificateConfig.Builder()
                    .merchantId(merchantId)
                    // 使用 com.wechat.pay.java.core.util 中的函数从本地文件中加载商户私钥，商户私钥会用来生成请求的签名
                    .privateKeyFromPath(privateKeyPath1)
                    .merchantSerialNumber(merchantSerialNumber)
                    .apiV3Key(apiV3Key)
                    .build();
    // 初始化服务
    service = new JsapiService.Builder().config(config).build();
    return service;
}

如下是错误信息

[{"code":"SIGN_ERROR","detail":{"detail":{"issue":"sign not match"},"field":"signature","location":"authorization","sign_information":{"method":"GET","sign_message_length":85,"truncated_sign_message":"GET\n/v3/certificates?algorithm_type=RSA\n1765362220\nqeFssCwHvCPJf9gdma7eD8NRjvvnYOVR\n\n","url":"/v3/certificates?algorithm_type=RSA"}},"message":"错误的签名，验签失败"}] HttpRequest[{"http_method":"GET","url":"https://api.mch.weixin.qq.com/v3/certificates?algorithm_type=RSA","uri":"https://api.mch.weixin.qq.com/v3/certificates?algorithm_type=RSA","headers":{"headers":{"Authorization":"WECHATPAY2-SHA256-RSA2048 mchid=\"1101245633\",nonce_str=\"qeFssCwHvCPJf9gdma7eD8NRjvvnYOVR\",timestamp=\"1765362220\",serial_no=\"4AB2683D6D167EA4D1886131C437BFB485BFCC0E\",signature=\"H5dn8BK00qbe7jOX2Gl40YN4at8EdROuCGJ3uh9UzPE/G200Rg5lVlUuZcidTxQVSS9qj/fcIdcG0npIFzl2ISFWr7TiwK7TZnbkbM1oStMRRnfGymaMntQyZIV1r5ks1Tb2sclnn4rJQ47m4MZ2V0Yovx3cllwzR7gsFMG46vIe86uhdPaObnpHPbhqm2cvcCG+iLdGzNKprjQ/75mapHT0ntg9Vr5GIpCgFdufhxMoesZRBnweNLE7tAPWjF357FST00QvWcOuZociZgLFlsmGEcmj4AVcRW0XO6Ea+CYkx8zfj812fE5bKaXTTe9eqlva82k2nJP532JyynISRQ==\"","Accept":" */*","User-Agent":"WechatPay-Java/0.2.17 (Windows 11/10.0) Java/17.0.16 Credential/WechatPay2Credential Validator/ okhttp3/null","Content-Type":"application/json","Wechatpay-Serial":""}}}]