xamarin android项目支付网关提交金额，显示金额提交失败错误

如何解决xamarin android项目支付网关提交金额，显示金额提交失败错误

我正在使用 xamarin android 项目添加支付网关，但出现交易失败错误。支付网关打开并运行良好，但当我提交金额时，出现交易失败错误。我的代码是：

using System;
using System.Net.Http;
using System.Text;
using Android.App;
using Android.OS;
using Android.Runtime;
using Android.Support.V7.App;
using Android.Views;
using System.Threading.Tasks;
using Android.Widget;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using Android.Content;
using System.Collections.Generic;
using Android.Content.PM;

namespace androidbindingapp
{
[Activity(Label = "@string/app_name",Theme = "@style/AppTheme.NoActionBar",MainLauncher = true)]
public class MainActivity : AppCompatActivity
{

    protected override void OnCreate(Bundle savedInstanceState)
    {
        base.OnCreate(savedInstanceState);
        Xamarin.Essentials.Platform.Init(this,savedInstanceState);
        // Set our view from the "main" layout resource
        SetContentView(Resource.Layout.activity_main);
        Button button = (Button)FindViewById(Resource.Id.button1);
        button.Click += BtnOnClick;
     }

     private void BtnOnClick(object sender,EventArgs eventArgs)
    {

            // Create your application here

            string amount = "1";
            string transaction_ref_id = Guid.NewGuid().ToString().Substring(0,10) + "UPI";
            string transaction_ref = Guid.NewGuid().ToString().Substring(0,10);
            using (var uri = new Android.Net.Uri.Builder()
                .Scheme("upi")
                .Authority("pay")
                .AppendQueryParameter("pa","33123451234@SBIN0004875.ifsc.npci")
                .AppendQueryParameter("pn","vijay shankar tiwari")
                .AppendQueryParameter("mc","9999")
                .AppendQueryParameter("tn","pay tips by vijay")
                .AppendQueryParameter("tr",transaction_ref_id)
                .AppendQueryParameter("tid",transaction_ref)
                .AppendQueryParameter("am",amount)
                .AppendQueryParameter("cu","INR")
                .Build())
            {
                Intent = new Intent(Intent.ActionView);
                Intent.SetData(uri);
            }

            if (IsAppInstalledindevice("in.org.npci.upiapp"))
            {
                Intent.SetPackage("in.org.npci.upiapp");
                StartActivityForResult(Intent,9999);
            }
            else
            {
                var packagename = PackageName;
                Toast.MakeText(Android.App.Application.Context,"Bhim is not available in your 
                device",ToastLength.Long).Show();
            }
        
    }

    private bool IsAppInstalledindevice(string PackageName)
    {
        PackageManager pm = this.PackageManager;
        bool installed = false;
        try
        {
            pm.GetPackageInfo(PackageName,PackageInfoFlags.Activities);
            installed = true;
        }
        catch (PackageManager.NameNotFoundException ex)
        {
            installed = false;
        }
        return installed;
    }

    public override void OnRequestPermissionsResult(int requestCode,string[] permissions,[GeneratedEnum] Android.Content.PM.Permission[] grantResults)
    {
        Xamarin.Essentials.Platform.OnRequestPermissionsResult(requestCode,permissions,grantResults);

        base.OnRequestPermissionsResult(requestCode,grantResults);
    }

    protected override void OnActivityResult(int requestCode,Result resultCode,Intent data)
    {
        base.OnActivityResult(requestCode,resultCode,data);

        if (data != null)
        {
            TextView textView = FindViewById<TextView>(Resource.Id.textView1);
            String dataString = data.GetStringExtra("txStatus");
            if (dataString != null)
            {
                textView.SetText(dataString,Android.Widget.TextView.BufferType.normal);
            }
        }

    }
   }
 }

当我运行程序时一切正常，支付网关打开，它要求付款，但当我提交金额时，它显示错误交易失败。我已经在我的移动设备上安装了相应的支付网关。