The codes come in two kinds. The first is for a new customer's first order: the discount is counted automatically, the code has to be entered before the order is placed, and a minimum basket condition can apply.
The second kind is tied to how you pay: the discount is given only when the order goes through Alif Nasiya. You open a limit in the Alif app first, and the basket has to be above a set amount; with any other payment method such a code does nothing.
Neither Korzinka nor Alif publishes these terms on its website, so the app is what shows the final condition, and each code page records the source and the limits. When a campaign stops, its code stops with it, so check the text in the app before paying. Offers from other delivery services sit in the food and delivery section.