After Paytrail bought Checkout Finland, they ended up using the payment interface built by Checkout. The old interface will stop working by June 2022. I built support for the new interface in the store, and with it, the codes related to the cash register and the purchase process were renewed on a large scale. The new codes are simpler, more stable and more dynamic than the previous ones. The appearance also received a significant update (UI) and the user interface (UIX) was extensively renewed. The renewed UIX helps the customer to buy even more effortlessly.