You should be fine. I entered Thailand yesterday using dtv for the first time, and my visa approved back in November. Got my 6 months stamp and no questions asked 👍
They want to see receipt of purchase of training classes that have been paid for at a fully licensed gym. But make sure the gym is fully licensed or you could be rejected. I paid for 3 months in advance and was accepted, not sure if anyone’s gotten away with less 🤷♂️
obviously I don’t know your situation but I would’ve asked a friend or family or carer to do it. You’ve just handed all your personal information over to a someone you don’t know, hope you trust them 🙏