@Samantha ***********
just keep it simple. Just say that you are an officer of company x and your employee (you) is paid y yearly and allowed to work remotely. For extra credit you could stress that they are not allow to do business with anyone inside of Thailand.
Then show the bank statements showing your deposits, IE paychecks. You might get some flack if they are all over the place, but if you write your pay is base + commission that would clear it up.
Always remember they are basically looking to make sure you aren't going to get here and: A) run out of money or B) work illegally. As long as your information shows that it is fine.