If you want to return a part of your order, we will issue a new Credit Voucher, or a refund to your Shukran Pay wallet. The rest of the amount will be refunded to your Credit or Debit Card. 
This could work in the below manner: 
Imagine an order with three products worth SAR 20 each, having a total value of SAR 60. The order was paid for with a Credit Voucher or Shukrans worth SAR 30 as well a Credit or Debit Card. If you return two products, your refund of SAR 40 will be split between a Credit Voucher or Shukran Pay, worth SAR 20 (refund of SAR 10 for each product) and a Credit or Debit Card refund worth SAR 20 (refund of SAR 10 for each product).