Nirmala: As per the system flow seller can request amount from the admin for the order. If user request for refund also, first of all admin has to settle the amount to seller,the same amount only seller can refund to buyer.nnNote: Only in split payment direct payment go to the seller account, But in  normal payment  method the order amount goes to admin not for the seller.Once seller received the payment,seller can refund the amount.