most embassies accept an ending balance of 500k. Some requier the money to have been in the account for several month... you need to check the requirements of the embassy/consulate where you plan to apply.
Tunisians apply for visa through the Royal Thai Embassy in Rabat, Marrocco.
You should visit their webpage to read more about their requirements and processing time. There are no such thing as "get it immediately". You apply online at thaievisa.go.th
After you sent your application with the required documents, they can still get back to you, to ask for additional information as well as request an interview (I've seen cases where the applicant was located far from the embassy and the interview were done by videocall).
Once your visa is appoved a pdf-file will be sent to you by e-mail. You print the visa and show it together with your passport when you travel to Thailand.
Anonym deltagare you write that you are worried you won't meet the bank statement criteria since you just recently reached above 500K... I believe that is what Paul replied/referred to since there are previous posts that the embassy/consulate in Laos require your ending balance to be above 500K for at least 3 month when applying in there.
Use the search tool in this group (to the upper right) and search for "Vientiane" to read about others experiences... Then decide if you want to change/forfeit your bus ticket and visa or not.
it has to be online-work for a foreign registered company and with foreign clients/customers. I.e. you can't do any business in Thailand targeting foreigners.