To pay processing fee for newly born son at London Visa office

[jassee]

All Seniors, Please guide me,

I have the situation, that I am sending my all documents to London Visa Office now for me, my wife and son (6 months old), I had send only forms for me and wife as initioal application to Canada to Sydny, and that time i had paid the processing fee for both of us by the credit card of my sister (living in canada), My initial aplication is aproved and I am sending my all documents to Canadian Embassy London now, Can you guide me now:

1 I have to pay processing fee of $150 for my son now, Please tell me the best way i can pay from U.K. as Barclays is not providing whatever is the acceptable paying method for visa office.

2. I am doing the covering letter for my son and putting his information in all our forms, and sending his birth certificate, passport copy, do I need anything special to include or to fill any special form for him.

I am almost running out of time now, Can you please reply soon.

Regards

Jassee