Redeem voucher?

Pr
1

What happens if I have entered an amazon voucher? Will it then be deducted from my bank what I want to order from amazon? I already have NO BANK where the money will be deducted from the ordered goods. How does it work with the voucher cards from Amazon, Netflix etc?

Gu

Netflix: You don't even need to provide a bank account for Netflix. I only pay for my Netflix account with gift cards. This will top up my account. Nothing will be deducted from your account.

Amazon: At Amazon you need to have a bank account. However, if you click Redeem voucher code or Pay with voucher and then draw a bar, it says 0 euro. Then it worked. Then you end the process and the account will not be debited as long as the voucher covers the amount in full.