The flow starts with the amount the cashier enters. The customer sees exactly what they are paying on their own phone and approves. Nothing is charged without that approval, which leaves an indisputable record for both sides.
If the balance falls short the sale doesn't stall: the remainder is completed from the customer's saved card. Card storage and charging run on Turkcell Paycell infrastructure; Wally never stores card data.
Scan and approve take a few seconds and the cashier never juggles a second device.
Wrong amount charged? Refund it from the panel and it reaches the customer immediately.
No. Wally payments run in their own flow; your register and bank POS stay exactly as they are.
Wally payments are online. During an outage the customer pays with cash or card as usual, and the wallet picks up where it left off afterwards.