I hope the medical results are better than feared and wish your father a complete recovery.
For your prayers you could try Gongkar Choede Monastery, they use a PayPal alternative. http://www.dzongpa.com/index.htmlhttp://www.dzongpa.com/Donations.html
If you still have problems with the card, email them and ask, the monks will help. Garuda was one of the empowerments Dorje Dhenpa Rinpoche gave when he came to the UK.
You could try to contact Rinpoche directly through his Facebook page:
I hope all goes well for you and your father