Hi Manuel 🇫🇷 👋
Sorry to hear you're having issues with the gas stations. We are always working to ensure our cards have the best acceptance possible, so next time you run into the issue, if you could note down the date/time, name and location of the gas station and send it through to our support team, we'll be able to look into it in more detail and work on a solution to ensure you can use your cards at these terminals.
About Dual PIN, Johannes gave you a great explanation. It's indeed related to the terminal validating the PIN on the card, while dual PIN requires the terminal to go online so we can validate your second PIN. Thanks for pointing this out, it's brought to our attention that we need to make this a bit clearer to people 👍