You don't need a bank account. There are many solutions available if you want to scan a QR code.

And using tap to pay using Apple Pay or Google Pay is getting more common now too.

For everything else, cash is king when it comes to local sellers. And its good to have some small change for tips or temple merit making donations. Keep tradition alive.

Anyone can.

The most important points is you have to sign a declaration that you spent less than 180 days in the country.

Only an agent can help

You can keep it in your brokerage account.

can only do 1 extension.

If you want to reside in Thailand, this is not the visa to go for unless you also intend to travel internationally

You can fly out then fly back in if there is a flight schedule that works with that.

You should also plan to enter the other country too.

Land borders usually they make you stay overnight or 2 nights

Requirements for samut prakan from another post can be found doing a search.

You do need a rental agreement. So if you are in Bangkok you need to extend there, or you go book a flight and leave for a few days.

I suggest Malaysia. The air is better there

From previous threads, save yourself the trouble and spend time in another country and reenter and get 180 days

Its pm2.5 season in Thailand all over so your lungs will thank you. Even Samui I saw from webcams looked hazy.

The embassy will post their requirements in the host country local currency or USD.

Its irrelevant to them if the applicant has a Thai bank account.

One can obtain a Thai bank account as a tourist. Even now as long as you have a good reason (real estate purchase. The seller can probably assist) or an agent.

Those requirements is the bureaucrats way of saying leave me alone or suffer the consequences