This method retrieves collection transactions (payments) performed by customers. For payload explanations for both request and response, click here 
using OneKhusa.SDK; 
using OneKhusa.SDK.Models.Transactions.Collections; 

//code omitted for brevity 

OneKhusaResponse<List<GetPaymentsResponse>> response = await client 
    .Transactions 
    .Collections 
    .GetPaymentsAsync(new GetPaymentsRequest 
    { 
        MerchantAccountNumber = 12345678, 
        TransactionDate = new DateTime(2026, 2, 1), 
        IsIncremental = false, 
        PageNumber = 1, 
        NumberOfReturnedRows = 20, 
        SearchBy = SearchFields.TransactionReferenceNumber, 
        SearchText = string.Empty 
    }); 

if (response is { IsSuccess: true, Data: not null }) 
{ 
    foreach (var payment in response.Data) 
    { 
        Console.WriteLine($""" 
            SourceCustomerName: {payment.SourceCustomerName}; 
            ConnectorName: {payment.ConnectorName};  
            CurrencyCode: {payment.CurrencyCode}; 
            TransactionReferenceNumber: {payment.TransactionReferenceNumber}; 
            TransactionAmount: {payment.TransactionAmount}; 
            TransactionFee: {payment.TransactionFee}; 
            TransactionDate: {payment.TransactionDate}; 
            TransactionStatusCode: {payment.TransactionStatusCode}; 
            TransactionStatusName: {payment.TransactionStatusName} 
        """); 
    } 
    return; 
} 
//it means an error has occurred: RFC7807 compliant error object
Console.WriteLine($"""
        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();