In the past two months, I've bought two tickets from Vistara, one from Air India, paid for my e-Visa, and booked a train on irctc.co.in without problems. Use a combo of Citi and Chase cards for the various purchases. As I mentioned above, Citi temporarily blocked the e-Visa charge, but once I said it was legit, it went through just fine. YMMV obviously.