Do you mean debit cards? With very few exceptions, you can't pay with direct debit in-store, and for online payments at merchants that don't know/trust you yet as a customer it's also pretty uncommon.
Online the same, you just use your card details like a credit card, the payment system is the same for years now anyway - thats the whole point of initiatives like this digital euro and Wero!
As a side note, in some countries, it is actually possible to initiate a direct debit at the POS (since cards sometimes contain enough information to recover the IBAN, mostly for historical reasons), but this has significant risks for the merchant and is usually not worth the hassle as debit card fees are very low anyway.
The Digital Euro does not exist yet, and Wero is yet another scheme (settling via SEPA instant credit transfers, I believe, but that's more of an implementation detail and doesn't change the fact that it is its own scheme with its own rules).