Wallet and family sharing

I don't believe that you can add a payment method to a child under the age of 18, but I'm struggling to find additional information about that. Again, the setup document for Family Sharing only talks about setting up a payment method for the Family Organizer.

EDIT: No where in the setup for Child Apple IDs does it indicate anything about adding a payment method to a child Apple ID. Family Sharing and Apple ID for your child - Apple Support

What are you trying to do with Wallet on the iPhone? Any purchases made by a minor in Family Sharing is done through the Family Organizer, and if you have Ask to Buy activated, you would still have to approve the purchase. I don't see anywhere in the instructions for setting up Family Sharing to use Wallet.

I understand that. I'm just saying that it may not be possible to have any kind of payment method at all, whether it be for iTunes or anything else to a minor's wallet. Is this debit card added to your wallet? Is the debit card in the child's name? Is it from a bank that is supported in Apple Pay? Not all debit cards can be added to Apple Pay. It has to be from a supported financial institution. Up until a couple of weeks ago, my bank's debit card was not supported. It was just added, and I was just able to add it to my wallet.