Would they be given their own credit card, or would it be under the parents? Over here minors can't enter into debt contracts like credit cards, so it'd be a direct debit until they are adults.

there are plenty of cards on the interwebz to use. ppl give em away like candies

Because 16 years old do not have a card with no spending limits, and with very low online spending limits. Most of those cards are even just for withdrawing