I don’t get an SMS to confirm my purchase

All your online payments are protected with a new authentication protocol 3D Secure 2.0, which has 2 additional stop factors: a secret word that you set up in the app, and a unique OTP code sent to your mobile phone for the purchase authorization.

Thus, when confirming your online purchase, first you need to introduce the secret word/phrase, that has been set up in the app, and only then you will be prompted to fill in the SMS code.