We have just completed a magical few days travelling in Myanmar using Oway Travel. Despite the enormous complexity of using slow wifi from our cruise ship throughout the process, we booked flights and hotels, paid by credit card, and we issued etickets and hotel vouchers. We had excellent communication by email from Oway Support Team, and we could not recommend them more highly.
That's not to say there aren't challenges travelling in Myanmar. Flight times get changed, so you need to confirm and re confirm!
V and N, UK