Paying friend/family's visit visa application fee

[sumayyahhai]

My parents are applying a visit visa from Pakistan to UK.

My father has already paid for his application but my mother's is still pending. There's some issue with his credit card he's trying to resolve but he can't make a payment at the moment.

Would it be okay if I log in to their application and pay from here in the UK from my bank account? Or is the payment bank supposed to be local? The currency to be paid is mentioned as PKR so I'm unsure if that will affect her application adversely.

I am not sponsoring their trip or paying any cost towards their visit. Just wanted to get their application submitted soon.