Thai Air

I was told that if the purchase by credit card, you must have to use ticket.I want to buy tickets to Australia for the woman to immigrate.

You can buy a ticket for someone who does not hold a credit card, but airlines such as Thai Airways, you must complete a consent form. Other companies may have similar rules, but you'll need to contact them to find. Here is what Thai Airways needs when the traveler is not the owner of the credit card.
http://www.thaiair.com/booking/non_pax_t ...

You can verify this but once you have the ticket, he has nothing to do with how you bought it ... Make sure your wife is allowed to immigrate and his name on the ticket is identical to his name on his passport .... and his passport is valid
Make sure you have all this information.

Last year I had a situation similar to yours.
I had to buy a ticket to Bangkok with Thai Air Italy and my wife was the owner of Thai credit card and it does not fly with me.
I called Thai Airways to Bangkok to see if she could use her card to buy tickets for me, but they told me it was to fly with me too.

So I bought the ticket from this travel agency in Bangkok http://www.saveflights.com/ run by foreigners.
I transferred the amount of the ticket on their bank account in Bangkok and after a couple of hours I got my ticket in my mailbox.
Really excellent service. This website has also been used in the past few friends of mine. It is reliable and prices are average.
They offer tickets to all destinations from Thailand only.
This is the page that you should look http://www.saveflights.com/country/austr ...

yes you can, I do it all the time for my son but as she is Thai, I think you must have a return ticket in a period of 3 months time.