No, it wouldn't be alright.
You are committing fraud.
Now go pitch pennies or whatever you 5th graders do these days.
are you sure because I have to call them in order to finalize the transaction, wont they be able to see that the debit card number holder is under 21
are you sure because I have to call them in order to finalize the transaction, wont they be able to see that the debit card number holder is under 21