So the 60 day tourist e-visa requires you to buy a plane ticket first. If we'll undecided on our departure date, can we buy a refundable plane ticket, refund it and buy our ticket when we'll ready?
TLDR : Answer Summary
The 60-day tourist e-visa for Thailand typically requires proof of travel, but you can submit expected travel plans instead of a confirmed flight ticket. It's acceptable to buy a refundable plane ticket if you're undecided on your departure date and refund it later. Keep in mind the visa is valid for use within 90 days once issued.