There is much involved for those who use the monthly income method to provide immigration with proof of international money transfers from outside Thailand. This for people who are extending their visas. The whole thing is quite a mess really. ATM withdrawals don't work for such situations.
These 3rd party transfer services are shaky to use & obviously not !00% reliable in meeting immigration expectations. However, unless you can walk into a bank in your home country to do a wire transfer, you may have no choice but to use these services. I was able to arrange wire transfer from my home country bank via the internet, but was no easy task,
I assume this discussion is about the BKK-CW office? Some are also swearing on a stack of TM-30s that it is required for a 90 day report as well. Fortunately, I don't have to report to that office. I just did my 90 day & handed the IO my yellow book. End of story.