Erik Mc Thundersteel that's great and I am sure that you enjoy it there in Cambodia, but I love Thailand, so having to pay 4000 BHT and stay in a very nice hotel over night seems to me to be a simple and very affordable solution. Compared to the $400 that I paid in the USA for the same test without a room.
Test and Go is an incredibly inexpensive solution to the problem of letting people with Covid into the country. Yes, not having to do anything would be nice, but Thailand has the best solution to keeping the doors open of any Asian country.
Don't send money! If you think you will lose her if you don't, you are in luck, because they grow women here and there are more than you can imagine. So, find the one that doesn't ask you for money or if it's your desire the one that gives you something in return for your money, both are here in abundance.
It's not the hotels responsibility to know you are entering the country and they don't expect to test every person coming to hotel. Some hotels don't even have RT-PCR testing. I booked with Agoda initially and then tried to schedule the testing and pickup with the hotel. Total Cluster F$#@. Had to go directly to the hotels site and rebook with a testing package and cancel my Agoda booking.
I got an immediate response that they had received my application and that the results would be sent within 7 days. Others post the same result, so if you are not getting that much it might be you have sent with the wrong email. Another post also stated that they require Gmail