For the extension of my visa exempt in the past, I had to pay when I handed in the forms for processing, I paid 2000 THB and after half an hour I got back my passport, receipt and change.
Maybe procedures are different at different offices? My experiences are from Hat Yai
I only have experience with extension of visa exempt in Hat Yai, but there I needed to pay in cash at the officer when handing in the documents, so before decision.
Did they request for drivers licenses, or did you just upload far more than asked, which caused extra attention and now they ask for something extra because they just want to see the application is real and you reply
A bank just has to comply with more requirements and is controlled by other institutes. You can say Wise effectively functions as a bank, but that does not make it a bank. I also can function effectively as a bank to you when you hand me over your money and I promise to give it back immediately when you ask for it, but it seems obvious to me that it is not the same for visa approval.
Wise cannot give bank statements, as long as it does not have a bank license, but it is strange that the Wise account is accepted when you apply and not when you extend. Obviously immigration here is more strict than MFA. But it also means transferring the money to a real bank account before extending and transferring back to Wise afterwards should work. Wise normally does this within seconds, so you can show during visit immigration.
In Netherlands Revolut also has a banking licence, in the past it was only in Lithuania, resulting in Lithianian IBAN number, but now I have Dutch BIC/SWIFT plus IBAN. Wise is indeed not a bank.