This method approves the posted merchant payout to transfer funds to the beneficiary and this is applicable for 4-eye and 6-eye principle workflows. For payload explanations for both request and response, click here 
using OneKhusa.SDK; 
using OneKhusa.SDK.Models.Transactions.SingleDisbursements; 

//code omitted for brevity 

OneKhusaResponse<ApprovePayoutResponse> response = await client 
    .Transactions 
    .SingleDisbursements 
    .ApprovePayoutAsync(new ApprovePayoutRequest 
    { 
        TransactionReferenceNumber = "260219YXF882", 
        MerchantAccountNumber = 12345678, 
        ActionedBy = "joe.doe@example.com" 
    }); 

if (response is { IsSuccess: true, Data: not null }) 
{ 
    Console.WriteLine($""" 
        MerchantAccountNumber: {response.Data.MerchantAccountNumber}; 
        TransactionReferenceNumber: {response.Data.TransactionReferenceNumber}; 
        ResponseCode: {response.Data.ResponseCode} 
        """); 
    return; 
} 
//it means an error has occurred: RFC7807 compliant error object
Console.WriteLine($"""
        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();
Note: This method accepts custom idempotency key generated by your system. By default, if not specified, it will create one on your behalf.