要2个证书号serial直接进微信商户号查看第二个pt_serial需要命令行生成1.查看证书序列号,进入到apiclient_cert.pem所在目录openssl x509 -in apiclient_cert.pem -noout -serial微信支付v2 v3密钥必须32位不然可保存但使用会报签名错误2.下载平台证书必须php7以上命令1.composer self-update 更新composer22.composer require wechatpay/wechatpay 下载wechatpay包下载完在vendor/wechatpay如果下载不下来就删掉根目录的package.json.lock重新执行上面命令下载3.进入./bin/CertificateDownloader.php -k ${apiV3key} -m ${mchId} -f ${mchPrivateKeyFilePath} -s ${mchSerialNo} -o ${outputFilePath}./bin/CertificateDownloader.php -k Qazwsxedcrfvxx6 -m 16302 -f /www/wxin/bin/apiclient_key.pem -s 35F323FBDC8ABE59xx258C40D -o ./获得平台证书-及序列号3.商家付款配置