微信支付运营工具商家转账功能接口/v3/fund-app/mch-transfer/transfer-bills对接，Wechatpay-Serial 使用RSA方式从平台证书中提取公钥对平台证书的序列号进行加密，提示：{"code":"PARAM_ERROR","message":"平台证书序列号Wechatpay-Serial错误"} ，按照常见问题：https://pay.weixin.qq.com/doc/v3/merchant/4013053279 确认了，都没有问题，还是一直显示那个错误！

下面代码是加密方法：、

public static string EncryptWithPlatformCertificate(string plainText, string platformCertificatePath)
        {
try
            {
                string certificateText = File.ReadAllText(platformCertificatePath);
                certificateText = certificateText.Replace("-----BEGIN CERTIFICATE-----", "").
                    Replace("-----END CERTIFICATE-----", "").
                    Replace("\n", "").
                    Replace("\r", "");
                byte[] certificateBytes = Convert.FromBase64String(certificateText);

                X509Certificate2 certificate = new X509Certificate2(certificateBytes);
                RSACryptoServiceProvider rsa = (RSACryptoServiceProvider)certificate.PublicKey.Key;
                byte[] plainTextBytes = Encoding.UTF8.GetBytes(plainText);
                byte[] encryptedBytes = rsa.Encrypt(plainTextBytes, true);
                return Convert.ToBase64String(encryptedBytes);
            }
            catch (Exception ex)
            {
                throw new Exception("加密失败: " + ex.Message);
            }
        }