@Luis Peña Muñoz if you need it to be sequential then you'd need to implement maybe an incremented custom field using Butler, pretty tricky. If it's just a matter of making it easier to remember or discuss, just refer to it using the first 3 characters of the card id. You're unlikely to get a colision. For example if the card ID is YkHNLyD6 just refer to it as "ykh".
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