sorry I don't know of any I normally do it .myself as it is good to get the experience and knowledge and most of all save unnecessary spending with agencies they are very helpful but better to do alone 👍🙏
cheers as far as I know go to Laos get the stamp then upload but I'm not sure after the upload how long you have to stay there before they call for you to pay the fee ? I know for sure that they will not accept walk ins so is it a appointment to pay the fee how long you wait after upload ?
I know after the fee is paid obviously we come back on a tourist visa and wait the 3-15 days just this new visa stuff is still not clear I called the immigration and they were not helpful in a sense they have not enough knowledge because it's only since Jan they have implemented this