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He can just phone them and pay her balance using his card.
Some credit card companies do refuse payment from another visa card but not often.
If he is willing then that would resolve this issue.
Can I clarify anything for you?
if he has credits on any account or can obtain credit then he can do this.
He can apply for personal credit.
No. Another person can pay off the credit of another if they choose.
Obviously he would have to consent and he may not but that is different points.
I'm happy to continue with this but please rate my answer