Request To Pay Checkout

using OneKhusa.SDK;   
using OneKhusa.SDK.Models.Transactions.Collections;   

//code omitted for brevity  

OneKhusaResponse<InitiateRtpCheckoutPaymentResponse> response = await client  
   .Transactions  
   .Collections  
   .InitiateRequestToPayCheckoutAsync(new InitiateRtpCheckoutPaymentRequest  
   {  
       Payment = new CheckoutPaymentTransactionDto  
       {  
           Amount = 15000.00M,  
           Description = "Groceries Payment",  
           SourceReferenceNumber = "QWSFCTXF233433"  
       },  
       Route = new CheckoutRouteDto  
       {  
           CallbackApiUrl = "API-URL",  
           SuccessRedirectionUrl = "SUCCESS-REDIRECTION-URL",  
           FailureRedirectionUrl = "FAILURE-REDIRECTION-URL"  
       }  
   });   

if (response is { IsSuccess: true, Data: not null })  
{  
   Console.WriteLine($"""  
           MerchantAccountNumber: {response.Data.MerchantAccountNumber};  
           SourceReferenceNumber: {response.Data.SourceReferenceNumber};  
           PaymentTransactionId: {response.Data.PaymentTransactionId}  
       """);  
   Console.ReadLine();  
   return;  
} 
//it means an error has occurred: RFC7807 compliant error object  
Console.WriteLine($"""  
        Type: {response.Error?.Type};  
        Title: {response.Error?.Title};  
        Detail: {response.Error?.Detail};  
        ErrorCode: {response.Error?.ErrorCode};  
        Status: {response.Error?.Status};  
        Instance: {response.Error?.Instance};  
        Errors: {string.Join(";", response.Error?.Errors ?? [])}  
    """);  
Console.ReadLine();