Guys question, the payment option "ATM bank transfer" do you know if I really can only use ATM machine for that or can I just send them the funds via my online bangkok bank service?

If this is about transferring Baht (payment) from your Bangkok Bank account to another Thai bank account, then of course you can do it via online banking instead of using an ATM.

There is nothing special about using an ATM.

 

I had issues, but it’s possible.

 

You print off an invoice, scan it at the ATM and it debits your account.

 

The Kasikorn ATM couldn’t scan the code, I got the staff out the branch,  they scratched their heads and told me to withdraw the cash, they scanned the paper at the counter and they accepted the cash. 5 mins later I had an email confirmation from apple. 
 

You could just add your debit card to the apple store and shop without leaving the armchair. 

If you bank at SCB you can scan the invoice in their app and you're all set.  The same is possibly true with other banks/apps.