Yes, I know that they are the official website to buy tickets but please follow my advice.
I tried to buy two tickets yesterday and got an "error with credit card" message, so I tried again (for the same seats and same credit card). Once again, the error message.
To my shock, Visa charged me for both transactions... but no tickets were even confirmed from AXS. In fact, those seats are still for sale!
Have read that I am not the only one with this issue, so please do yourself a favor and avoid AXS.