No, you or anyone cannot because you need to Submit a DTV E–Visa Application on the Thai eVisa Website:
Afterwards, the Thai eVisa Website will create a QR Code that you need to Download and PRINT out as a hard copy on Paper for the Thai Embassy/Consulate in Laos, then the Thai Embassy/Consulate can accept your Thai E–Visa Payment in Thai Baht CASH in–person
also, when you go to make Payment in Cash, they will not accept any documents of your E–Visa Application and will probably tell you to upload any documents to the Thai eVisa Website if there are any additional document requests