STOP spreading misinformation. This is ONLY for Laos. You pay online everywhere else. In Vietnam you pay online. In Cambodia you pay online. In Malaysia you pay online. It's only Laos.
Technically no, if there is no stamp in your passport with a consideration date, then your permission to stay ends on the date in your passport as normal, because there is nothing in your passport giving you additional time. I would probably go back to Krabi on your last day if you cannot get ahold of them.
The thing he's referencing as must be printed is specific to Laos. After you apply for the visa online, you must wait for them to send you a confirmation with barcode. You print that and take it to the embassy or consulate where you applied between certain morning hours to submit payment for your visa application.
Same criteria possibly, but not the same procedure. The embassy and consulate in Laos is the only place where they will send a confirmation that you print and take to the embassy to pay. Everywhere else accepts online payment for the visa.
You should edit your post to include the specific Embassy or consulate that you used, whether it's Vientiene or Savannakhet.
There's no such thing as a multiple entry non-O visa anymore.
Are you actually on the 90 days of a Non-O visa, or are you on 1-year extension of stay?
I'm assuming you're on an extension of stay because you said you want to go back for "a few months" and a 90-day stay would not cover that period of time.
If you're on the 1-year extension of stay based on retirement, what you need is a re-entry permit. What is stamped on a visa is irrelevant because the visa is void as soon as you enter Thailand it's used up.
So check your passport and see if you can find your 1-year extension stamp, and if you can find a re-entry permit that's valid until the end of your extension. If you have that, then you are good to go. If you do not have it, then you need to purchase one from either your immigration office at the airport on your way out.
Some people already have a bank account before they arrive with the non-O from being in Thailand previously. And next year you'll be able to apply early. How early is up to the immigration office you use. 30 days early at most offices, 45 days early at some.
Someone just reported being asked to show 20k with a DTV yesterday. DTV is a tourist visa. ANY tourist entry can be asked to meet the tourist entry requirements.