The codes on this page come in two kinds. The first are invite codes: the service creates a personal code for every user, and when it is used both sides receive a discount. The second are campaign codes for new users, covering the first order or the first few orders, each with a minimum of its own.
The published terms give the discount only on cashless payment, so a bank card has to be linked to the account, and the discount covers both the food and the delivery. A user is identified by phone number, device and IP address, so a first-order discount cannot be repeated from a new account.
Be careful with a code that spans several orders: an order below the minimum gets no discount, yet the service counts the discount as spent. Each code page sets out the conditions, the end date and what the service does not publish. Offers from other delivery services sit in the food and delivery section.