You must scan the QR code, click continue to attach the screenshot (it is the only proof of payment) and you can complete the purchase.
It was a bright sunny afternoon when I was totally frustrated of not having a good frame throughout the walk. Suddenly I saw three kids playing in the College Square area. I grabbed a frame immediately. The youngest one protested for clicking them without taking permission. I gently asked them what do you want? They surprised me with demand of just a cake and bread.