I used myir app the IRD has your earnings information. Go to to the year to date earnings copy that.
Go to yearly income and copy that.
The page will have your name and IRD number
Yes I contacted thru that address using the heading affidavit of income.
They gave details of process and bank details.
Once you make payment via a internet banking Thai account you copy deposit attach to email with your passport main page photo. Income photos and send along with your postal address