Download the Klarna app and create an account with your email. Add a bank card to make your payments. (Klarna will do a small credit study to validate your account).

In any order equal to or greater than 20 euros, you can select the option to "pay in 3 installments without interest". This way, once the merchant confirms the order, the first payment will be made using the details of the card (credit or debit) linked to the account, and you will receive a message once processed.

Sixty days after your purchase, you will receive the charge for the second payment. Sixty days after your purchase, you will receive the third remaining installment. You will receive a message in advance, just in case you need to add money to the card.