Hey there, abnoliz!
Thanks for reaching out in Apple Support Communities! We understand you're having trouble using your debit card with Apple Pay. It'd be our pleasure to help get you pointed in the right direction.
First, we recommend using the link below to determine if this payment method is accepted in your region:
Payment methods that you can use with your Apple ID - Apple Support
You can then follow the steps in the support article below for additional help with adding your card:
If you can't add a card to Apple Wallet to use with Apple Pay - Apple Support
If you're still unable to add your card, Contact Apple Support.
All the best.