Can’t add a payment method if you are controlling from an iPhone – Google Family Link Review

My son has a Samsung so he has the google play store I downloaded the family link to control his account but after 3 hours of trying to find out how to add a payment card to our family link account I’m to my breaking point. I have googled how to do it, went into my google account and still no luck. There should be a way to add payment through the app in the parent control but there definitely isn’t
Review by DominiqueTripp on Google Family Link.