suchithm/CustomWebViewRenderer.cs

## CustomWebViewRenderer.cs
using System;
using Diet.iOS.CustomRenderer;
using UIKit;
using Xamarin.Forms;
using Xamarin.Forms.Platform.iOS;
using WebKit;
using Foundation;
using System.Net.Http;
using Newtonsoft.Json;
using System.Net.Http.Headers;

[assembly: ExportRenderer(typeof(CustomWebView), typeof(CustomWebViewRenderer))]
namespace CustomRenderer
{
    public class CustomWebViewRenderer : WkWebViewRenderer, IWKScriptMessageHandler
    {
        public CustomWebViewRenderer()
        {
        }

        protected override void OnElementChanged(VisualElementChangedEventArgs e)
        {
            base.OnElementChanged(e);

            if (e.NewElement != null)
            {
                LoadCustomWebview();
            }
        }

        async private void LoadCustomWebview()
        {
                RazorPayload payload = new RazorPayload();
                payload.amount = Constant.NetPayableAmount * 100;
                payload.currency = "INR";
                payload.receipt = GenerateRefNo();
                payload.payment_capture = 1;
                RazorResp resp;

                using (var httpClient = new HttpClient())
                {
                    using (var request = new HttpRequestMessage(new HttpMethod("POST"), "https://api.razorpay.com/v1/orders"))
                    {
                        var plainTextBytes = Encoding.UTF8.GetBytes($"{Constants.RazorPay_Key}:{Constants.RazorPay_Secret}");
                        var basicAuthKey = Convert.ToBase64String(plainTextBytes);

                        request.Headers.TryAddWithoutValidation("Authorization", $"Basic {basicAuthKey}");

                        string jsonData = JsonConvert.SerializeObject(payload);
                        request.Content = new StringContent(jsonData);
                        request.Content.Headers.ContentType = MediaTypeHeaderValue.Parse("application/json");

                        var response = await httpClient.SendAsync(request);
                        string jsonResp = await response.Content.ReadAsStringAsync();
                        resp = JsonConvert.DeserializeObject<RazorResp>(jsonResp);
                    }
                }
                var js = @" <body onload=""openpaymentscreen()"">
             <script src=""https://checkout.razorpay.com/v1/checkout.js""></script>
                <script>
                var options = {
                    ""key"": ""@key@"",
                    ""amount"": ""@amount@"",
                    ""currency"": ""INR"",
                    ""name"": ""CodeLog"",
                    ""description"": ""AppliedCodeLog"",
                    ""order_id"": ""@orderid@"",
                    ""handler"": function (response){
                        window.webkit.messageHandlers.PaymentJSBridge.postMessage(response)
                    },
                    ""modal"": {
                       ""ondismiss"": function(){
                    window.webkit.messageHandlers.PaymentJSBridge.postMessage(""closed"")
                          }
                       },
                    ""prefill"": {
                        ""name"": ""@name@"",
                        ""email"": ""@email@"",
                        ""contact"": ""@contact@""
                    },
	               ""config"": {
			            ""display"": {
				            ""hide"": [{
					            method: ""netbanking""
				            }]
			            }
		            },
                    ""notes"": {
                        ""address"": "" address here""
                    },
                    ""theme"": {
                        ""color"": ""#ee3a70""
                    }
                };
                var rzp1 = new Razorpay(options);
                rzp1.on('payment.failed', function (response){
                    window.webkit.messageHandlers.PaymentJSBridge.postMessage(response);
                });

                function openpaymentscreen()
                {
                  rzp1.open();
                }
                </script></body>";
                //#33nine ninecc
                js = js.Replace("@orderid@", resp.id.ToString());
                js = js.Replace("@amount@", (Constant.NetPayableAmount * 100; * 100).ToString());
                js = js.Replace("@key@", Constants.RazorPay_Key);

                js = js.Replace("@name@", Constant.name?.ToString());
                js = js.Replace("@email@", Constant.email?.ToString());
                js = js.Replace("@contact@", Constant.mobileNumber?.ToString());

                Configuration.Preferences.JavaScriptCanOpenWindowsAutomatically = true;
                Configuration.Preferences.JavaScriptEnabled = true;

                LoadHtmlString((NSString)js, null);
                var _userController = Configuration.UserContentController;
                _userController.AddScriptMessageHandler(this, "PaymentJSBridge");

            }
        }
        public void DidReceiveScriptMessage(WKUserContentController userContentController, WKScriptMessage message)
        {
                MessagingCenter.Send("Message", "ClosePaymentPage");//call back to close the current contentpage
                var result = message?.Body;
                if (result != null && result.ToString() != new NSString("closed"))
                {
                    var paymentId = result.ValueForKey(new NSString("razorpay_payment_id"));
                    var orderId = result.ValueForKey(new NSString("razorpay_order_id"));
                    var signatureId = result.ValueForKey(new NSString("razorpay_signature"));
                    var error = result.ValueForKey(new NSString("error"));

                    if (string.IsNullOrEmpty(error?.ToString()))
                    {
                        MessagingCenter.Send<RazorPayPaymentData>("paymentId", eventKey);
                    }
                    else
                    {
                        MessagingCenter.Send<RazorPayPaymentData>("error", eventKey);
                    }
                }
          }
          public static string GenerateRefNo()
          {
                string refNo = "";
                Random ran = new Random();
                String b = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
                int length = 6;
                String random = "";
                for (int i = 0; i < length; i++)
                {
                    int a = ran.Next(26);
                    random = random + b.ElementAt(a);
                }
                int d = ran.Next(100000, 999999);
                refNo = $"{random}{d}";
                return refNo;
           }

          public class RazorPayload
          {
              public int amount { get; set; }
              public string currency { get; set; }
              public string receipt { get; set; }
              public int payment_capture { get; set; }
          }
    }
}
	using System;
	using Diet.iOS.CustomRenderer;
	using UIKit;
	using Xamarin.Forms;
	using Xamarin.Forms.Platform.iOS;
	using WebKit;
	using Foundation;
	using System.Net.Http;
	using Newtonsoft.Json;
	using System.Net.Http.Headers;

	[assembly: ExportRenderer(typeof(CustomWebView), typeof(CustomWebViewRenderer))]
	namespace CustomRenderer
	{
	public class CustomWebViewRenderer : WkWebViewRenderer, IWKScriptMessageHandler
	{
	public CustomWebViewRenderer()
	{
	}

	protected override void OnElementChanged(VisualElementChangedEventArgs e)
	{
	base.OnElementChanged(e);

	if (e.NewElement != null)
	{
	LoadCustomWebview();
	}
	}

	async private void LoadCustomWebview()
	{
	RazorPayload payload = new RazorPayload();
	payload.amount = Constant.NetPayableAmount * 100;
	payload.currency = "INR";
	payload.receipt = GenerateRefNo();
	payload.payment_capture = 1;
	RazorResp resp;

	using (var httpClient = new HttpClient())
	{
	using (var request = new HttpRequestMessage(new HttpMethod("POST"), "https://api.razorpay.com/v1/orders"))
	{
	var plainTextBytes = Encoding.UTF8.GetBytes($"{Constants.RazorPay_Key}:{Constants.RazorPay_Secret}");
	var basicAuthKey = Convert.ToBase64String(plainTextBytes);

	request.Headers.TryAddWithoutValidation("Authorization", $"Basic {basicAuthKey}");

	string jsonData = JsonConvert.SerializeObject(payload);
	request.Content = new StringContent(jsonData);
	request.Content.Headers.ContentType = MediaTypeHeaderValue.Parse("application/json");

	var response = await httpClient.SendAsync(request);
	string jsonResp = await response.Content.ReadAsStringAsync();
	resp = JsonConvert.DeserializeObject<RazorResp>(jsonResp);
	}
	}
	var js = @" <body onload=""openpaymentscreen()"">
	<script src=""https://checkout.razorpay.com/v1/checkout.js""></script>
	<script>
	var options = {
	""key"": ""@key@"",
	""amount"": ""@amount@"",
	""currency"": ""INR"",
	""name"": ""CodeLog"",
	""description"": ""AppliedCodeLog"",
	""order_id"": ""@orderid@"",
	""handler"": function (response){
	window.webkit.messageHandlers.PaymentJSBridge.postMessage(response)
	},
	""modal"": {
	""ondismiss"": function(){
	window.webkit.messageHandlers.PaymentJSBridge.postMessage(""closed"")
	}
	},
	""prefill"": {
	""name"": ""@name@"",
	""email"": ""@email@"",
	""contact"": ""@contact@""
	},
	""config"": {
	""display"": {
	""hide"": [{
	method: ""netbanking""
	}]
	}
	},
	""notes"": {
	""address"": "" address here""
	},
	""theme"": {
	""color"": ""#ee3a70""
	}
	};
	var rzp1 = new Razorpay(options);
	rzp1.on('payment.failed', function (response){
	window.webkit.messageHandlers.PaymentJSBridge.postMessage(response);
	});

	function openpaymentscreen()
	{
	rzp1.open();
	}
	</script></body>";
	//#33nine ninecc
	js = js.Replace("@orderid@", resp.id.ToString());
	js = js.Replace("@amount@", (Constant.NetPayableAmount * 100; * 100).ToString());
	js = js.Replace("@key@", Constants.RazorPay_Key);

	js = js.Replace("@name@", Constant.name?.ToString());
	js = js.Replace("@email@", Constant.email?.ToString());
	js = js.Replace("@contact@", Constant.mobileNumber?.ToString());

	Configuration.Preferences.JavaScriptCanOpenWindowsAutomatically = true;
	Configuration.Preferences.JavaScriptEnabled = true;

	LoadHtmlString((NSString)js, null);
	var _userController = Configuration.UserContentController;
	_userController.AddScriptMessageHandler(this, "PaymentJSBridge");

	}
	}
	public void DidReceiveScriptMessage(WKUserContentController userContentController, WKScriptMessage message)
	{
	MessagingCenter.Send("Message", "ClosePaymentPage");//call back to close the current contentpage
	var result = message?.Body;
	if (result != null && result.ToString() != new NSString("closed"))
	{
	var paymentId = result.ValueForKey(new NSString("razorpay_payment_id"));
	var orderId = result.ValueForKey(new NSString("razorpay_order_id"));
	var signatureId = result.ValueForKey(new NSString("razorpay_signature"));
	var error = result.ValueForKey(new NSString("error"));

	if (string.IsNullOrEmpty(error?.ToString()))
	{
	MessagingCenter.Send<RazorPayPaymentData>("paymentId", eventKey);
	}
	else
	{
	MessagingCenter.Send<RazorPayPaymentData>("error", eventKey);
	}
	}
	}
	public static string GenerateRefNo()
	{
	string refNo = "";
	Random ran = new Random();
	String b = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
	int length = 6;
	String random = "";
	for (int i = 0; i < length; i++)
	{
	int a = ran.Next(26);
	random = random + b.ElementAt(a);
	}
	int d = ran.Next(100000, 999999);
	refNo = $"{random}{d}";
	return refNo;
	}

	public class RazorPayload
	{
	public int amount { get; set; }
	public string currency { get; set; }
	public string receipt { get; set; }
	public int payment_capture { get; set; }
	}
	}
	}