I just had one ticketed.
Did another one for late October to take my +1 to Whistler which resulted in Vayama sending me the "Booking Verification" followed 15 minutes later by a "Booking Cancellation"
Tried booking same itin on cheaptickets.hk (Vayama's HKG sister) using a HKG based CC and got "Booking Verification" followed by nothing.
Will check if Amex has been hit. Maybe they do it manually over at cheaptickets.hk. Also not sure why Vayama ticketed my first but cancelled my second booking..
Why was my booking cancelled?
We could not guarantee ticketing on the flights you selected. Cheaptickets is a US-based travel agency, and certain itineraries (particularly some that originate outside of the US and Canada) may not be able to be processed through our automated ticketing system.